I replaced the bios chip with one from Badflash, and also got a customized IDE cable from him. Other than that, everything else I did myself. I mounted my 9mm thin 10 gig Fujitsu drive to the existing heatsink standoffs (throwing the heat sink away) using a couple of plastic miniblind brackets. I picked up an $8 5V fan from a parts house to go on my Winchip 2, which plugged right in (no soldering required for the chip, although I did solder the leads for the fan). I didn't have to cut any holes in the case either, and 128 megs of ram just plugged right in.
You don't have to get a kit to mount your drive. Look in all the misc. junk you probably have in the garage and I'm sure you can come up with something innovative.
Resist the urge to be lazy (not putting you down, we all have that!) and read through previous posts on this board. There is a search function available that will help.
It's terrible that so many people are not getting any satisfaction on their IMOD order. I sent a couple e-mails asking a question because I was considering getting a kit, but I never got a reply. Consequently I didn't go that route.
I'll leave you with something my dad instilled in me from a very young age. "We're Americans, we can do ANYTHING." Innovate!