I've got a H9 Spitfire,Hellcat,P40,Corsair all 60 size and a 150 size P51 and P47,Pulse 40 and Pulse 60,Tango Sundowner 50, SU-26 Sukhoi and my trusty old PTS P51 all great models simply construction,well finished and like all before have said,just glued up the firewalls on ALL of them before building and never had any issues.
We can't buy direct from H/Hobbies as we're in Australia,so I purchase everything through Wholesale Trains in NY,they're excellent and if I ever have issues with a model ie missing parts or damage they immediately have air freight the replacement parts,can't ask for better than that
Cheers[8D]