I agree with Brett. If you need to park before close things get complicated, eg what if the mount control crashes or loses power?
Also, auto close is a whole different thing to auto close and open. Auto close can be as simple as a rope and a truck wiper motor winding it up.
Sorry if you've mentioned this before, is the OBS in yr back yard, as in you can pull it open yrself when it gets dark, sleep and then auto close? . Or fully remote and far away?.
Just auto close is simple and cheap to knock up closing on a timer or rain ,AAG or Boltwood, directly, no reliance at all on a flakey PC
. And if battery powered with a charger on it all the time,close on power loss.
I have tube video of my rope-windup-roof if you want to see how simple it can be.
Roof open and closed sensors can jus be micro switches at the limits, easy.