Looking at my system, and considering the size of the sagniaw and sanden, I think you would need to go with a remote reservoir system to make AC or compressor work and still fit with the stock fenders.
I think it would be best if you were to go with a reservoir like this from PSC and mount it super low (about 3 or 4" lower than mine is):
PSC saginaw reservoir
Of course this setup requires you have a reservoir that has two returns for hydroboost since the PSC can doesn't have any. You would also tilt this can/pump one way or the other to get around the compressor unit.
Then you would mount the sanden right above it. Sounds like an interesting project, but not one that I want to drop coin into right now.
Without the stock fenders there may be other options using a regular can and extending it up with a tube to the side.
Eric