I've done it in the car, but wouldn't recommend it.
For nosecone (tailbone in this application) mount, we've made spacers and we change the 7mm studs to bolts, so you can mill a small recess in the nosecone mount to clear a couple of bolt heads and then then whole thing bolts to the stock 1x2 in the stock VW mount holes.
One thing Danny probably hasn't experienced is that not all of the gear sliders are shaped the same, so there are a few styles that are vulnerable to letting the hockey stick slide out of reverse without actually shifting the trans out of reverse, so you have to TIG a small bead on the end of the 2nd gear slider to prevent this, but now the slider is too long to engage 2nd gear fully before it bottoms out inside the nosecone, so you have to mill a recess inside the nosecone directly across from the 2nd gear slider to make room for a full shift.