Commodore 128D internal 1581 disk drive

Attempting to improve on the perfection that was the 128D, Commodore engineers got their hands on a Commodore 128 motherboard and attempted to create another "D" (for desktop) variation based around their up and coming 1581 3.5" disk drive, instead of the normal 1571 5.25" version already designed. Sadly this version has never passed into production and stayed as a one of a kind prototype. Until now, I have custom designed and 3d printed a series of parts that allows us to mount a reproduction 1581 disk drive in place of the 1571, essentially recreating of a prototype. In the context of the Commodore 128Dcr: in order to connect a 1581 in the place of the 1571 the first thing you need to do is disconnecting the 1571 from the IEC bus. To do that you need to remove the IC U113 from the board, because pin 1 of the U113 is the ATN signal. You can desolder the chip or just cut the legs. in the C128Dcr thre is 2 test points towards the front middle of the board for 5v and gnd, you can solder