You have a point.....
How about this. I'll lay out my entire plan, step by step, and you all tell me what you think.
1. Get a receiver that will handle a 45-70 or other 45 express rounds.
2. get a barrel chambered for same.
3. have gunsmith install barrel on receiver, and put on a front sight.
4. find a stock, and put on the gun.
5. install a tang sight.
6. make a bunch of smoke.
Naturally, I'll have the gunsmith make sure the ejector will work for the specific cartridge, as well.
What do y'all think?