Nice shop! I dig the burn table. That chopper is coming right along. I have the same Terra bike, I turned it into our mailbox
As Skipp said, The Coker 14 x 6 is your best bet for the rear tire. Front should be a 4.10 x 3.50 x 6, bonus points if you can find a vintage Carlisle ribbed version.
Keep up the good work!!