Consider it being up there with doing a replacement tranny job for an ATX. So the whole subframe is coming out, transmission, axles. And you're also replacing the cars ECU (behind the power steering tank) with one from a MTX car and the PATs chip.
You're then going to remove your center console and the whole PNRD assembly, your pedal assembly, cut the carpet to run the shift cables and then install the new pedal assembly (neutral safety switch), and MTX shift gate.
You are far, far better off getting a donor car (which should be dirt cheap nowadays) so that way you have every nut & bolt needed. Plus the PATs chip and ECU so you can actually start the car. If you have a shop do it I bet it's probably close to $2k with labor. You can make a little bit of that back if they buy your old trans and donor parts car off you. Since they could just turn that into an ATX at this point. If it's even worth their time.
That also doesn't include replacing parts that you should probably do while the whole thing is out. Control arms, inner & outer tie rods, bushings and stuff like that. I think mine, including cost of the donor car, was around $1k. Took about a week to do, and I had help, but there was some computer issues that tripped it up.