I have the PART sets for every model in my stash which has them available! I may not use all of it, but I'm especially impressed with the radiators and engine panels with cooling slots etc. This is where these sets really shine. Here are pics of the sets for SPAD VII, SE5a and Pfalz XII - if you'd like pics of any others, I probably have them, so let me know and I'll post them.


Interior framework is a good guide but may not fit well unless you really thin out the fuselage halves.
The seatbelt and seat sets are excellent, as are the control horns, but the wheels ar not so good, the spokes being a little too thick. Prop bosses are also worth the cost, even though they give you 4 or 5 bosses for each of about 6 aircraft (including a SPAD SA2 - can't think why you'd need 5 of those, but they do work for other models even if not 100% accurate!)
Ian