Pale Rider,
That .U. marked dogleg hammer would bring $200+.
If your plan is to use this carbine as a shooter a flat type III hammer would give you a easier pull.
The funds from the sale of the dogleg would go a long way toward a stock for you.

As far as a complete rebuild/restoration....These early issue carbines cost big bucks to try to restore.

Cheers
Charlie-painter777