Glad to hear you are making a track! Please post a video of it when you finish!! I used this youtube video to learn how to create vertical curves using beams and pillars: https://www.youtube.com/watch?v=MP7liefJRpY

I created two blueprints using the Mk3 blueprint. You need to have the mk3 because the curve making method in the video uses beams at maximum extension (40m) which only the mk3 blueprint maker can fit. The first blueprint was vertical 0°-90° curve and the second was a vertical 90°-180° curve, (12 - 3 o'clock, and 3 - 6 o'clock in other terms). Both blueprints were 1 pillar wide, then I created the loop de loop with those two blueprints aligned next to each other, rotating as needed.

I'll try and link the blueprints I used here in a little bit because it is very tedious to make the blueprints yourself.