WRT54GS 1.0 The GSv1.0 has a 4712 processor. It will run best on VINT builds but regular will also work.
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.
Why is there no kamikaze image for the WRT54GL v1.1