Wasn't terrible.
I paid $150 for both seats. Had steel on hand to build the brackets.
I posted this in my build thread and there are a few more photos, but the brackets are two simple "bars". One across the front and one for the rear. I used 1" square tube and some 3/16" plate for the tabs that bolt it to the seat rails. This gives somewhere to weld on the mounting feet in the right locations.
You MUST remove the rear heater under the passenger seat. You'll have a hole in the floor where the heater lines were that you'll need to cover and you might want to find a piece of carpet to fill the hole where the factory carpet didn't cover. With the rear heater removed you might choose to complete remove the rear heater lines, but this is a PITA. I just used a piece of heater hose to bypass (connect) the two lines under the floor since those are now open after you removed the heater.
Also, because the rails on the VW seats are much wider than the Cruiser ones you need to notch or flatten the raised rib in the floorboard (where it starts to go vertical over the trans tunnel where the front of the seat bolts to the floor). If you don't do this the seat will be too high and too far to the outside and the doors won't close. I just flattened it some with a hammer to give enough clearance for the seat to be in the right position.
The seat heaters are pretty straight forward but I haven't wired them yet. Should just need power and ground and switch. I have heard that these seat heaters aren't the most reliable but I guess I'll find out.
Same thing for the power recline. Just had to find the right wires in the VW plug (red/greystripe and brown in the large black plug) and make a new connection to the Toyota power seat wires.