Yes, some have put in manual racks, but had to have some parts on it(don't remember what), had to be made to fit the mn12.
I'll see if I can find that stuff....
I have a 95 and run manual steering on it, but with the power rack. I looped the fluid lines together, and it has been fine since.
I run skinnies up front, so that helps with the "hard" steering. Its not that bad, but I'm sure a manual rack would be easier.
May you fly low and fast
rest in peace JL