Yep...bolts right up. Swap the clutch and flywheel over and thats it. Only 'issue' if you can call it that is the air filter on the OS is much bigger and so doesnt fit under the body shell., but nothing a few minor modifications cant fix.
Make sure you get the pull start version if you want a direct replacement, otherwise if you have a starter box, you can get the other version (non-pullstart).
Be good to post in the buggy or on-road thread as well, let others know how it went and any issues you had with it.
One problem with Smartechs is lack of information and so the more people that post in the threads, others will benefit.

cheers