i think it is yes.
i hope the next one is a corsair.Good start of an aircombat model collection, Raymon! Be careful, more will follow :-)
Engine mounted up-side-down is very impractical and problematic. When you fly alone - with no rush @ take-off then OK - and it looks nice. But for aircombat plane you use the simpliest and most robust solutions. Flooding/problems with starting/ rotating plane up-side-down to start the motor correctly/ much more prone to damage at landing etc - just a few I can name and I have experienced when mounted motor up-side-down.