This base will help you get started on making a custom station. This particular base is made for a B&M Floorless and it's length will need to be adjusted to your coaster. Freeze your coaster then place it over the existing station to line it up. This file is made for Skethup 2013, I'll upload a 3DS format if requested.
https://dl.dropboxusercontent.com/u/67178604/Floorless%20base_NL2.skp