My 2 cents ...
I don't think we need options for scale - it seems clear from the feedback on this thread that a Castle Grayskull the same scale-to-figure as vintage would not command $200-$300. Let's suggest the scale is at minimum, He-Man able to ride Battle Cat through the Jawbridge while holding a weapon.
1. Front facade/diorama
2. Vintage toy update (2 walls, trap door, internal floors, throne, etc)
3. Deluxe (option 2 plus lights/sounds/electronics)
4. 4-wall castle with roof (including internal floors etc from option 2), elevation for 'abyss' and ramp (preferably FILMation )
And I'd be inclined just to nominate a price (i.e. $200 or $250 or $300) and ask folk to vote on that basis.
Sorry. Still complex.