You know, you´re kind up against a wall with this one. What you could consider is two options. Sell the home, the car, the wife and the kids and buy an STL-11000 as they have all this solved and built in.
Luckily I bought mine before I got married there is just no way I would be allowed to buy one now!
The other option is to get an H-Alpha filter for the front of your lens and have some fun. I say H-a because that is the coolest one but if you feel like going RGB don't let m stop you. With that set-up you can do anything between great nebula shots to scientific work mapping little known nebulas.