Welcome to the board.
Now if I understand the question correctly : You have no 336/337 experience, you are not yet a pilot, and you want to know how much you can alter a Skymaster, up to and including changing it to such a degree that it could only be flown as Experimental ?
Is that what you are asking ?
Perhaps the more important question (other than WTF
might be: after you have determined your 80% mission profile, what safe mod may or may not be available that would allow a Skymaster to fit that profile?
So perhaps we should start there: What is your 80%+/- mission profile/demand ?
And again - Welcome and best of luck in your training.