linothorax and other white cuirases

[Dan Howard]

maybe if you used superglue, but definitely not with natural glues available at the time.. once broken, you need a new armor.. and i didnt even mentioned whole another story of cleaning, and weather effect and maintenance etc.

If you have used neither glued nor quilted armour over an extended period then you have no idea how it functions and how it needs to be maintained. So you start by reading texts written by people who have done this and make reconstructions based on these writings and try to confirm it. Sitting in a chair and making empty speculations helps nobody.

besides, having such a rigid glued plate is not that different from metalic plate.. and metal would provide much better protection and would be much easier to wear.. like those Italic musculated plates Samnites used

This makes no sense at all. Quilted textile armour is just as rigid as glued armour. Go and look at some examples of real armour. Here, yet again, is a list of some fairly complete examples just in Europe. On top of this there are hundreds of smaller fragments, some dating right back to the Bronze Age. All of them are quilted, not glued.

Two of them are in the Holstentor Museum in Lübeck
A partial example is in a museum in Stendal - the chest section is still intact.
One is in the Musée des beaux-arts in Chartres
One is in the parish church of Rothwell, near Leeds
The Victoria and Albert Museum has a layered cotton example from India (called a peti)
The Royal Armouries has another peti from the arsenal of Tipu Sultan.

If you can't get to any of these places then go and look at good quality kendo armour. The arm guards (kote) are made of nothing but quilted cloth and are as rigid as a board.

Textual evidence of layered textile armour.

Ordinances of Louis XI of France (1461-1483)
And first they must have for the said Jacks, 30, or at least 25 folds of cloth and a stag's skin; those of 30, with the stag's skin, being the best cloth that has been worn and rendered flexible, is best for this purpose, and these Jacks should be made in four quarters. The sleeves should be as strong as the body, with the exception of the leather, and the arm-hole of the sleeve must be large, which arm-hole should be placed near the collar, not on the bone of the shoulder, that it may be broad under the armpit and full under the arm, sufficiently ample and large on the sides below. The collar should be like the rest of the Jack, but not too high behind, to allow room for the sallet. This Jack should be laced in front, and under the opening must be a hanging piece [porte piece] of the same strength as the Jack itself. Thus the Jack will be secure and easy, provided that there be a doublet [pourpoint] without sleeves or collar, of two folds of cloth, that shall be only four fingers broad on the shoulder; to which doublet shall be attached the chausess. Thus shall the wearer float, as it were, within his jack and be at his ease; for never have been seen half a dozen men killed by stabs or arrow wounds in such Jacks, particularly if they be troops accustomed to fighting.

Dominic Mancini (1483): writing about the archers in Richard III's army
They do not wear any metal armour on their breast nor any other part of their body, except for the better sort who have breastplates and suits of armour. Indeed, the common soldiery have more comfortable doublets that reach down below the loins and are stuffed with tow or some other material. They say that the softer the garment the better do they withstand the blows of arrows and swords, and besides that in summer they are lighter and in the winter they are more serviceable than iron.

Howard Household Accounts (mid 1400s):
I took to the doublet maker, to make me a doublet of fence; for every four quarters: 18 folds thick of white fustian, and 4 folds of linen cloth, and a fold of black fustian to put without.

Companion of Hernan Cortez (16th C)
The armour which they use in war are certain loose garments like doublets made of quilted cotton, a finger and a half thick, and sometimes two fingers; they are very strong. Over them they wear a doublet and hose all one garment, which are corded behind. This garment is made of thick cloth and is covered with a layer of feathers of different colours, making a fine effect… for neither arrows nor darts pierce them, but are thrown back without making any wound, and even with swords it is difficult to penetrate through them.

Aguado, History of Venezuela (16th C)
Out of sacking or light linen cloths they make a kind of surcoat that they call 'escaupil'. These fall below the knee, and sometimes to the calf. They are all stuffed with cotton, to the thickness of three fingers. The layers of cotton are quilted between folds of linen and sewed with rough thread…

The Irish "Cattle Raid of Cooley" says that Cúchulainn was wearing armour made of 27 layers of linen (liente) and an apron made from the hide of yearling oxen.