I actually did a legionare back when my character was talutah_rs.
So, couple of things....heavy board shield? terrible idea, its heavy and slow. Use a regular board shield, you'll be more combat effective since its slighty faster and definitely lighter. Dont worry, that baby wont break anytime soon either.
Sword options (gladiesque)-
short nordic war sword- higher cut, very fast
short arming sword- higher stab, less cut, very fast
sword of whine- a slightly longer arming sword
gross messer- high cut, worse stab, little slower than the others
Armor options-
Any of those middle mails that are made for norse including drz
Also consider the banded armor, or the cuir de buille
helmet:
spiked helmet-goes without saying
milanese sallet-same structure as a roman helmet actually just has a face mask
nordic warlord helmet- maybe?
steppe helmets-more of a thing worn by foreign conscripts into the legion
hand:
leather gloves at most with hand armor
Foot:
splinted leather greaves over mail
For your build, drop the wpf for throwing. Completly unecessary, especially at 7pt. Get to the front lines, throw all your javies like candy and then fight with a sword.