Finally got the assembly done . Made carriage wheels from steel caster wheels $8.99 ea
Turned the casters to what I thought looked good .
After a bit of puzzelment I welded the carriage together .
After a few test firings it is good to go !
Next one will look better , I hope
The bore is 5/16" . I made a ram rod to clean out the primary fire cracker .
Firing it with breech open the rear ignitor cracker stays in place .