early continental shoe (picture)

[Martin Moser]

Are those of a military style Chuck? Is tehre anything similar that the legionarys would have worn?

Most probably not. Roman shoe finds all have a more elaborate pattern/technique.

I want to make a calceus but don't have a leather form.

What timeframe are you thinking about? Let me know and I'll see what I can find for you.
Ah, btw. did you look at http://www.florentius.com/calcei-main.htm ? You'll find good instructions there ...