Kell I use crushed glass for autos every time. It's perfect. I use a medium for all the parts you mentioned. The jams won't take much at all. Might use 10 or 25 lbs I bet. I guess you mean the trunk when you say ending compartment. Trunks suck because they fill with media and it makes it harder to do the floor of it. You may have to stop and scoop or vacume some out while you are doing it. Can't be too big on a car like that. If it's just paint maybe 150 lbs is my guess. Now the bottom, that depends on if it is all undercoating. And on the agravation level if it is not going to be lifted high enough to work on easily. There isn't really any paint under there so it will not take much just to clean off the metal. I would allowI would allow at least 250 lbs just because it may be hard to reach some angles and you might just let it run in an area for a while to get all up in it. If it is all undercoating you never know. It can be pretty thick in some spots. I have come across as much as a 1/4 inch at times or it can be just a skim coat that blows right off. It absorbs the impact and can come off pretty slow at times but it will come off. You might bring somthing to scrape a little with. The ending compartment may also be undercoating allow extra there too if it is. And if he wants the under side of the trunk lid done remember it is thin metal. Go easy like 50 psi and sweep back and forth so you don't build up heat. Bring light that you can get under the car with. You souldn't run in to body putty in those parts but you could on any of them. The customer will always tell you there isn't any if you ask. I bring a die grinder with me now. They are $30. to $50. and you can remove all of the plastic for a few cents worth of wheels. They are not flat sandpaper wheels. You want the ones that are a plastic mesh like a crubby pad for doing dishes but a harder material. Harbor frieight, norther tools home depot. Next I can almost promis you he will get a price and then show you a box of parts and a bumper that"you might as well hit while your here" and so on. Be strong. You have to charge for everything. So you might use 6 bags you might use 15. You know what your media costs you. Labor, I would think at least $400 or $500. if you have to crawl under it. Box of parts is up to you but add at least $50. and what ever glass it takes. Good luck. Hope this helps