Bullseye... used the original toybiz bullseye head,arms, legs and holster.. cyclops body and hawkeye belt.. black colour base and some blue drybrush.. enjoy
Not speaking for Headless or any of the other customizers on here, but I would guess that he and something like 99% of them would tell you to invest in a rotary tool, something along the lines of a Dremel. Bout the only way you are gonna be able to hollow out the head to fit on the neck ball.
The figures contained in the Custom Showcase are not for sale by Figure Realm, and the creators of the customs are no way affiliated with Figure Realm. The Custom Showcase is purely for entertainment purposes and only provides a means for the creators to show off their work and trade ideas. Figure Realm does not make or sell customs.
Customizing figures is a straightforward hobby. If something needs chopping, you chop it lol.