Ok, since no one has chimed in i'll take a stab at it.
Youve stated it...They are a 41 rimfire...you can search these forums for laoding and cartridge availability.
As for construction...they do seem to be a little better built than some of the other 41RF suicide specials ive seen. Thicker cylinder walls make it a bit stronger. Action is similar to all of the spur triggers...
...make it a centerfire and still prescribed antique. but remember that 41RF is a weak little cartridge...load to 41 colt spec and BOOM! no more fingers. Yould have to chop those 41LC cases wayyy down, load a very light bullet...and I think the original was only 13 grains of black.