The problem is you will also need the FD3 card that controls the floppy drive. If you already have that, the next thing is software. The software on the Big Blue actually needs to be rewrote to see the floppy, simply copying the tapes into binary format won't work.
Getting someone's "boot disk" is probably going to be very difficult. You would need to find someone with an exact machine. Big Blue controls didn't have a lot of parameters, stuff like travel limits were hard coded, so if you want an extra 1" of 'Y' travel, it used to be a phone call to Siemens.
You might want to look into a BTR instead.