Hey Tim,
nice to see you back
Indeed, it is very feasible to do some Rendez Vous with SSU.
The trick is really to planify what you want to do step by step.
First thing is to be already confident with standard Rendez Vous with powerful Spacecraft like the deltaglider.
Also, a good knowledge of Orbit , Align plane, and Sync Orbit MFD is a big plus.
These MFD are really the bread and butter of a virtual MCC center, plus a calculator to convert Metric data from MFD into Imperial one from the Shuttle.
It is the sum up I made, with all the different phase of a Rendez Vous like it is written in Nasa documents
https://www.orbiter-forum.com/showthread.php?t=40283
First, you phase. Chaser has a lower orbit than the target.
Here a table to help you to do that
http://imagizer.imageshack.us/a/img924/2806/Fekgrf.jpg
To know what is the difference of angle between the chaser and target , you can use the ship apoapsis fonction of the Sync MFD
It will give you the Dlng which corresponds to how many degrees you have to catch up the reach the target.
Hence, you adapt the shape of the orbit to adjust the catch up rate with table above
Here the Sync MFD, DLng is zero as we are on the final rendez vous phase
http://imagizer.imageshack.us/a/img924/1151/3qB4py.jpg
Second, you want to null the Relative Inclination between the two objects.
Align plane MFD and you do a burn on Y axis at node.
0.1° of Rinc= 100 ft/s ish of Shuttle DV ( 10 % of total)
Third, once you are close enough ( couple of degrees from Target), you start to reduce the catch up rate by increasing your orbit.
Finally, 2 or 3 orbit before the rendez vous, you match both apogee altitude, with a slightly lower perigee ( 6 Nm less than target) to have a shallow catch up rate and you can start using the Spec 34 GNC page to pinpoint the rendez vous ( less than 100 km from ISS)
You could have a look in the DPS pictionnary page 110 ( and we can provide you more info when you will get there of course)
https://www.nasa.gov/centers/johnson/pdf/359895main_DPS_G_K_7.pdf
Then Proximity operations etc
I would say , just try it phase by phase.
Start to well understand phasing first, then move to next step etc.
Finally, you will be able to do all the different part in one flight for a full rendez vous
It takes quite a lot of papers to write all the burn data and keep a track of where I want to go, but it is very feasible, no science rocket there