Thanks mrg, now I see what you're pointing to. That's the same mistake I made in the beginning of this all, SMH.Lots of suttle differences between frames but the most noticeable between yours and that Huffman is the single bar behind the seat clamp vs split on most frames all tho Monark & Westfield used that style sometime. I don't see any reason to try to shove the wrong tank on there ( never looks right ), just build as a rat rod and ride! if you come across some of the OG parts for a good deal later, great!
Also you're right about the wrong tank look. I haven't seen one yet that looked good to me but I was just checking to see if there were others that have used ones that did work.