I have used SF for my custom station building needs, over several flights. Read up in the manual, there is a whole section on orienting things in the PLB, and once you get the hang of it it will be a breeze, just need to alter the right numbers, but it is all covered in the manual.
Yeah I just installed SF and all the necessary add-ons (MFD's, the "KSCPatch" that includes a "hopefully" working AutoFCS, etc.). I remember my main difficulty was figuring out which parameters were the correct ones to alter. I know there's parameters for offset, rotation, and 1 more that I can't recall at the moment. I was just having trouble figuring out how to rotate/lower/raise the payload item properly. I remember being confused that each parameter was composed of 3 numbers ie. 0 1 0, then 0 0 1. I just couldn't figure out what those all meant.
I experimented for probably an hour or more at one point. I DID manage to either squish the payload mesh into a pancake, or make it look incredibly large (and flat), or just plain HUGE. I just couldn't figure out which figures to adjust to rotate the payload by a simple 90* so that the module wasn't placed perpendicular to the payload bay.
I recall that the default numbers were either 1 or 0. Are the only acceptable numbers 1 or 0? Or just anything between 1 and 0? I may have tried entering 90 at some point (with obscene results) because my train of thought was "I want to rotate it by 90*, so enter 90*". I was obviously very wrong haha.
I'm also going to need to brush up on what the X,Y and Z coordinate frames are in a 3D environment. I guess I was also partially hung up on thinking "graph paper", which is probably another reason I was just messing things up horribly.
I went over the manual several times but it really just provided an example for positioning the RMS. I couldn't wrap my head around how to translate it to adding a payload. Especially proper positioning. I'm guessing I'd have to look into the vessel's INI file to figure where the Shuttle attachment points are, then someone correlate and line those up with the SF payload coordinate system.
I'll take a good, hard look at it when I get home in an hour or so and see if I can't make sense of it. If not, I may be back. If I do come back, please be patient haha. I'm quite the newb with the SF addon and I'm just anxious to get to the point where I can add payloads correctly without putting too much thought into it.
Edit: Yeah. The whole payload system and setup eludes me. I looked at some of the included scenario files and I could see things were attached to the shuttle, but listed as "orbiting earth", even though the shuttle was on the pad. And there seemed to be cradles or something also in the bay besides just the main payload. And I also saw the in the shuttle part of it, it said payload mass=0. I'm basically lost.