Modify Arduino Uno to USB BDM

Hello there.

I´m new here in forum and this is my first post.
I´m also new knowing arduino boards and the reason is that i´m trying to build an USB BDM interface to be able to read an old CPU32 MC68376 + Flash 28F400.
This processor belongs to a Car BCM and i need to read the Flash so that i can do some work.
The reason for me to build this USB BDM interface is because i cant afford for now to buy an already assembled interface, so i´m trying to build one with what i have.
I have the schematics, drawings, BootLoader programing and Firmeware programing (programming in HEX files) for this USB BDM unit, but the chips are different so i was wondering if anyone can help me out on how to modify my arduino board so that it could work as a USB BDM interface.
I also have the possibility of building an old LTP BDM cable, but i need to find an old computer with LPT port or a PCIe LPT port card, because the LTP-USB adapters dont work on this...
I would really appreciate any help i can get for this.
So, if any of you can help, please let me know..

Cheers to all.
and Thanks