Marc,
Sorry for the late response; I've been away from the forums (as well as the modeling table to be honest) and didn't see this until now.
I worked on my Snipe only sporadically due to silly things like family, work & travel. That said, no major surprises for me so far. Cockpit and engine are done, fuselage is closed and base-coat painted (more paint to come). Similarly, the wings, tail stabilizers, etc. have their basic painting done. I hope to get some shading going tonight, but have been dragging my feet on cutting tape for masking the spars. Most of the potentially tricky stuff is still ahead of me.
As I'm sure you've read, the Aldis scope is rumored to be "fiddly", and I have seen recommendations to install it prior to attaching the upper wing (contra the instructions). Otherwise, I would say to be sure to follow the manual as closely as possible; I attached the compass to the instrument panel earlier than I was supposed to and had to break it off to get the IP installed behind the machine guns.
Speaking of the guns, one small issue I had was in getting them mounted in parallel to each other. I'm guessing it was do to paint getting into the various attachment points and the need to handle them gently with the attached p/e. Not a big deal, but a bit pesky.
All in all, any issues I've faced are particular to my shortcomings, rather than the model; its lovely. If I can get my act together, I'll put up some pics.