If you purchased all these things yourself, the cost would be a lot cheaper. These are just estimates to about how much it will cost for me to purchase the items AND do the mod.
Full Body Case Change: $25 for new case, $5 for me to install.
SR LEDs in the L and R triggers: $10 for me to install.
Jewel Mod: I'd have to order this for someone, probably for about $20. Takes a while to ship. Will install for $5.
SR LED's in UMD Door: $15 for me to install.
In total, part ordering and my services would be about $80. Not to mention the shipping it will cost for you to have your PSP shipped both ways, which would be about $10 more dollars.