Update 2016: This model contains errors.
Next week I hope to have the new model ready.
Credits: Model: http://sketchup.google.com/3dwarehouse/details?mid=9b56b25bbf3d7a2d26b0acd949e3f3&prevstart=0
Did this for someone in need of a tank. STL isn't perfect but this is what it turned out to be.
Added bolts lol, sorry guys, it was a quick job :) Needed adjustments here and there for wished end result.
Spray paint the bolts in a different color while leaving them on the tape. Second glue will give weird white oxidation effect if sticked on after. Can wisk it away.
Used car spray paint. I made the gamble to see if it would stick without a bonding agent and it does so far :)