Yay I can answer some of these

I am getting ready to mount some happs comp. joysticks in 3/4 MDF.
I've seen people use a router on the 3/4 MDF to get the joysticks to stick out further. Is this necessary?
Depends on your personal taste, mine are mounted in 3/4 inch and they seem fine to me. I thought they were a bit low myself at first but after some play time I felt better about them.
Also I lost one of the black pins that holds the joystick through the "base"?... is this something I can pick up at a hardware or electronics store, or do I have to order another from happs?
Should be available from any hardware store.
Oh yeah can I mount my ipac4 with extensions, tiny washers, and woodscrewsm or do I need to order "feet" for it?
I've not got an ipac but I use motherboard mounts to mount my controller and they work a treat. Again personal preference I think.
Oh yeah again... What's a good place to get t-molding?
I live in California.
Thanks.
I'm going to get mine from ebay but then again I live in the UK and I seem to have trouble finding arcade parts/trimmings

Give ebay a shot I'm sure there must be some on there.