I've rebelted countless decks and except for only a couple, all were pretty much done simply by observing the pulleys, their sizes and locations, and the pulley heights. Typically, each belt path is parallel so it's fairly easy to determine which pulley's are on the same belt which is simply common sense. If you go this route, you'll either get it right or wrong but I suspect that you'll be about 70% right. And if it's wrong, you'll know because either it doesn't work right, the spindles are going in the wrong direction, or something in which case, just juggle them around until you get it right. Also, if you purchased the correct sized belts, common sense basically tells you that flat belts goes around the flywheel and wide pulley(s). And if a belt is stretched too tight, it's routed wrong and if it's so loose that it's useless, once again it's most likely wrong.
Bottom line is that if you just go at it, get your hands dirty and give it a try, you can probably get it figured out in one evening, as opposed to waiting on these threads for an answer. Plainly speaking, if someone here has photos they snapped and stored in their hard drives, I'm sure they would share it, but if they don't already have those pictures, it's highly unlikely that they will strip down their example so that they can snap photos to share with you. Not saying they won't, some members have done it before. And if your deck was sitting in front of me, I would offer suggestions based on what I observe. But clearly, the best person to determine proper belt routing is you since you have the actual deck before you and can see the unit in 3-D and can rotate, feel, spin, do things that we can't based on a single 2-D image. BTW, you may wish to remove the deck from the chassis which will give you far better view of things. Sometimes, it's absolutely necessary in order to remove the flywheel backing plate which you'll need to do in order to route belts around that flywheel. And if you lift that flywheel off, 80% of the time, the routing becomes so much clearer since there is probably another pulley under that flywheel that is hidden from plain view. So just dig into it and see what happens. I know it's scary but you might be pleasantly surprised to see it wasn't as difficult as you thought.