Hi Allan - never built one, but I have built Blue Max kits before. They can build into a very nice and accurate replica, but they will take a little modelling skill here and there.
Obviously a limited run kit, so my recommendations are test fit, test fit, test fit, and you will be ok. Take care also in manufacturing struts; Blue Max gives you bendy strut stock which is no good. See if you can manufacture some new struts from a more solid material.
In terms of the kit itself, they used the Datafile plans as a reference so it is quite accurate in outline. It is soft in detail in some places (interior, engine, guns, prop, etc), so be prepared for some replacement parts. I still feel that the replication of the planked fuselage on this one is the best around for 1/48, and beats out the Fly kit in this regard. I have a vision at some point of a kit bash (if I can ever get a decent streak of time at the bench...!)
Good luck, looking forward to seeing progress pics!
Cheers,
BC