Not much to it.
I used large size 5 1/4 diameter hydraulic filters from the garbage at the local truck stop.
I made a band from a piece of steel strapping used to hold freight on shipping pallets.
Sand acid wash and flux and flame solder all the bit together.
clone stuff :: 100_9867.jpg picture by Dougwp - Photobucket
I did a double band inthe tow areas where the sadles would go to hang the tank.
As seen in other post.
The filler neck is from a garden hose, and the sadle is justa piece of pipe I sliced with a saws all and hammered to curl up around the frame rail on one side and the tank on the other.
clone stuff :: 100_9876.jpg picture by Dougwp - Photobucket
The sadle is held in place with a 5/16 bolt and wing nut threw the factory 165 fake gas tank mount.
A valve from a lawnboy mower is threaded into a 1/4 steel washer solder to the tank bottom.
A little sliver paint and its done.....
You can get fancy too!
This was a still born 2 compartment tank for a methonal engine.
One side was intended to hold methanol and the other flush to prevent corrosion.
clone stuff :: 100_9977.jpg picture by Dougwp - Photobucket
This is old news.
others have built them now too