If you're not willing to invest in a proper sidemount rig, then dive backmount. Sidemount works for all types of diving IF you are properly trained in it. If not, you can cobble something together and put yourself at serious risk.
Sidemount is not something for the untrained to put together from bits and pieces. Experience sidemount divers can do this. I've built two custom rigs around actual sidemount wings.
The parts are available. But, you need to know what you are doing.
At the time I built my rigs I had been teaching sidemount for a couple of years and had experience with 7 different systems. And I had a few hundred sidemount dives.
Why do you think you'll need to sidemount? That's the question you should be asking and if it turns out you truly require a sidemount configuration, get the training, get a proper rig, and get a couple hundred dives in with before trying to jury rig something.
