I don't work on satellite systems due to the poor/non-existent factory support that is currently out there. I have lots of requests to do so, but there are so many systems that one person just can't be well versed on them all....and the manufacturers don't help at all either.
I would stay away from this......regardless of the cost if they :
1. are no longer in production
2. no factory tech support is available
3. no factory authorized installers are available.
Satellites are a breed to themselves and unless you are very well versed in electro mechanics and electronics, they are really not a DIY item.