Re: frame recommendation help
Glad to be of help. The Panther frame isn't being made anymore, but Schwinn used the same frame with different names, decals, color schemes for a number of years, a couple decades actually, so they are out there. The equivalent of Craigslist up your way or ebay will turn something up. It is worth the wait finding the right frame. The older Chicago made Schwinns were top of the line in their day and they were made well.
Sportscarpat makes and sells custom in frame tanks for two frames, the Worksman and the Panther. Or since you weld, make your own. Hope to see photos of your build in progress this winter.
Someday when I grow up I will probably lose interest in toys with wheels, but until then...