I have already made the payment.
I have also purchased a complete ChipSet at iComp. But they don't have the SuperBuster v11. I have a Buster v9, will it be valid for the A4000tx ?. I think so, right?
I believe the only place to get NOS Buster 11 IC at the moment is Analogic Computers
https://www.analogic.co.uk/new-amiga-390539-11-super-buster-chip-for-a4000-a4000t.html
looks like Screemo is also selling them has an addon to his A4000 custom chipset bundle here to but not separately
https://www.amibay.com/showthread.php?112041-A1200-and-A4000d-chipsets