Can't say I have extensive experience here in raising things--but raising people I've worked with a fair bit.
One book to check out is "On Rope" published by the National Speleological Society. I was able to find one in just about any library until I bought my own. It talks a lot about getting yourself up and down ropes. That's informative and useful, but the part you want to consider more is rescue work where loads of moving a person and medic approach those of a fair size frame raising.
By the way, I wouldn't personally use polypropylene for anything. I had a personal rule against it, and used it in a pinch to tie up my skiff on a very calm day. In perhaps six hours a gentle swell action untied a bowline with a safety. I didn't loose my boat, but I could have.
Never trust a knot in polypro: only a good long splice that's been properly seized.
With a few exceptions, I mostly use a sheath and core rope on the water, in the woods, and in construction.
I'm sure some talented folks with have a lot more to say.
Zach
