You might want to cruise the S&W forums as there have been threads about these and pictures. There might be some posts about them in the S&W area on this forum. First of all there is no "one" 945. Mine is an early no dash 5 inch but there were dash 1 and dash 2 guns. There were shorter barrel lengths for sure and I heard there was a 6 inch. There were SS ones like mine and blued ones and bicolor ones. Time for a picture.
I have pretty large hands and love mine but although they look sort of like a 1911 I don't think many of the parts interchange. The magazines for instance are different. I am not sure you could put a short 1911 trigger in one. Maybe a question for one of the S&W boards.
Accuracy of mine is up there with the best 1911s. You are under three inches at 50 yards with a Ransom rest and the right ammo. In Colt land a few of my Gold Cups and my SCG and oddly enough my WMK WWI repo did that from the factory.
In prep school and college I used to shoot bullseye and I used a Colt Gold Cup, a S&W 52 and a S&W 41. If I had had this back then I would have been all S&W, but, as I mentioned, it fits my hand well. On 1911s I like a flat MSH and long trigger.
I would try and at least hold one before you buy it if possible.