WRT54GS 1.0 The GSv1.0 has a 4712 processor. It will run best on VINT builds but regular will also work.
Why is there no kamikaze image for the WRT54GL v1.1
Putting OpenWRT onto the router is easiest by first installing DD-WRT. Then, after DD-WRT is running, use the update firmware page to place the OpenWRT image onto the router.