Snake
Getting there couple of thing I noticed straight off are your mud shoots on the side plate armour - they look too deep/big. Also the small road wheels are bogey pairs i.e. they have a little brace around each pair.
I could comment on the turret but as you said it is only rough at the minute. Although I would ditch the muzzle brake and supporting brace, the Tillys I have seen don't have these just a smooth 2pdr gun.