Re: Hopkins & Allen 32 rimfire info please?
In spite of the pioneering work of Joseph Vorisek, the whole H&A area still has a lot of gaps. There were XL DA revolvers made in .32 RF, though, including the XL Bull Dog and some of the M&H series (not the auto ejecting type we think of as M&H).
As to what parts fit, I don't know. There were just too many models and types and I don't know of any information on the mechanisms. Nor are parts available on any regular basis, though a letter to Gun Parts Corp might get more info as they sometimes have parts they don't catalog.
I share your desire to make old guns functional, but I have had ones that just were dead ends unless I actually made parts from scratch. I have done that, but only with higher quality guns where the time and labor was justified to some extent. In that case, of course, only you can decide that if you can make the parts yourself. To involve a gunsmith would be way beyond any reasonable cost effectiveness.