Where are you? There are frame builders in lots of cities, and if you can't find any try asking a bike shop - they are unlikely to do it in-house but might know someone handy with a welder.
Alternatively try a bodyshop (for cars) or general fabricator (the ones who make gates/staircases etc) - they might be willing or able to do it for a nominal charge, but then again they might not be interested. Best of luck - always good to keep an existing frame running if you can!
Where are you? There are frame builders in lots of cities, and if you can't find any try asking a bike shop - they are unlikely to do it in-house but might know someone handy with a welder.
Alternatively try a bodyshop (for cars) or general fabricator (the ones who make gates/staircases etc) - they might be willing or able to do it for a nominal charge, but then again they might not be interested. Best of luck - always good to keep an existing frame running if you can!