CyberShadow sir it would help if you could tell us which version of epic you intend to play.
Bike leaders, just drop the odd one here and there on regular bike bases.
Skinnerz commandoes would make for great bloodaxe clan infantry.
The heavy artillery battery would be odd boy super guns.
Gunners as mekboyz.
Ordinance set, generic big guns used on the crusha and beast models as well.
Junk tank, gunwagons.
As for dreadnoughts, my "Ironclad" dread proxies are under going an updated sculpt and will eventually return to the store. Also please note we are not done with the skinnerz yet by a long shot plenty more new additions to follow as well as the odd revamp of older figures from time to time.