Homebrew PCBs

Over the weekend, I picked up a nonworking 12-year old HP LaserJet IIIP
laser printer.  I was told it needs a new "scanner motor".  I am not
sure what that means; I guess it won't scan.

Anyway, I was planning to reuse it for heat/pressure only--i.e.,
as a laminating machine for using the toner-transfer method of PCB
production, instead of ironing by hand.

Is this a good idea, or is it a bad idea?

I know that I need to modify the machine so the PCB material will go
through the rollers in a straight line.    Anybody have experience
doing this?     Any other comments on this idea ?