small update... being I'm trying to make this as cheap ( also as safe ) as possible. I figured I could make my own gas tank from an air tank.. had this air tank for a few years, and I rarely used it/ they cannot be drained so it rusted inside.. I cut the top out of it, treated the rust to several gallons of vinegar, which cleaned it up pretty good.. I welded in the Speedway filler neck, and it's pretty much a spun aluminum tank for the cost of the filler neck.. I do have to cut a hole to weld in a bung for the pickup tube, and another hole for the float assembly... it will sit above the rails, but in the location it is in..