A few years back I bought a new RIA XT22 .22lr 1911 pistol and it's proven one of my favorites.
Shortly after getting it I'd decided to buy the .45ACP parts to convert it because it uses a standard .45ACP Tactical frame.
Armscor USA always seemed to be missing some of the parts needed, most notably the slide, until I checked their site again today and saw they had everything in stock, so it's all ordered.
Cost too much a la cart ($320) but what the hell.
Here's photos of the XT22 .22lr that's the basis of this conversion.