15mm US "Grizzly" Walker
I'd remove the Ma Deuce for VSF, and add a boiler and smokestack to the back.
Maybe shorten the gun barrel a bit.
15mm US "Hyena" Light Jump Walker
Might re-work the right hand into a gripper of some sort.
This says 'Armoured Combat Aethersuit' to me.
15mm German "Thor" Mechpanzer
Again, needs a bit of Victorian and steam-y flair, but I like the six legs.
15mm German "Spinne" Light Mechpanzer
I really like this one for an Imperial German Scout.
3 for 13 GBP, too...
28mm British Automated Infantry
I'd go with the water-cooled MG for VSF.
Reminds me a bit of the Parroom Station Clockwork Soldier.
Like the labels say...
The RPG armed one reminds me of the upgraded Ogryn from the Imperial Guard.
And last, a concept sketch I think is interesting...