Will be watching this with great intrest as Santa, aka, the wife, had one of these under the tree, well, not really under the tree (much to large a box), but close enough. I still have to finish a H9 P-40, 90% complete, before beginning the Tigercat. I can vouch for the effectiveness of the APC 15.75" X 13" 3 blade prop cut down to 15". I've done that mod on my H9 Spitfire with fine results. 1300+ watts with an e-flite 60 and 6s 5000 lipo. 15 X 8s just didn't get the job done. So you're figuring 20+ lbs.
Sounds like 1100 to 1200 watts per side to fly scale like. maybe 2 e-flite 60s & CC 80 amp ESCs on 2 6s 5000 batts?? Good luck! Happy new Year!!