Stc for removal of the landing gear doors

[Ron Moore]

The only reason, in my simple mind, to remove the doors is in event of engine failure on takeoff. With doors, the book says to not don't raise the gear until you have enough altitude to survive the descent their drag may induce as they open and close. Without gear doors, and with an engine failure, you could safely retract the gear and reduce drag immediately, without concern for loosing altitude whrn the clamshells open.
I fly one airplane with, and one without.
Rather than all of the mods to a 337, consider a T337, a vanilla P337, or a Riley Rocket, not the "Super" Skyrocket. Either will be way cheaper than what you're considering. The Rocket I fly has full deice, cruises at 200k at FL200, 32 GPH.