Sorry for superlate answer.
Plastic tanks have done flawless. Epoxy/resin won´t Work on these tanks. The safaris are between 0.7mm and 10mm+ everywhere i did cut them. That is why these tanks shouldn´t be used with any protection.
As long you got an good welder you can hack these tanks as much you want.
Maybe, 50% chance on that ´cause i don´t know the room required. The cover will go off, but the Work i can´t relate on.
High exhaust would (maybe)not be possible. The rear tanks will not allow it to go past. And you will end up the same problems as the new 1190 Adv owners. Heated nuts/butts. My new build will go back to 2-2 exhaust with out any connection.
KTM 950(1190) Adv-s, Soon to be Project 1190
KTM 530 EXC-R 08