Alex makes really killer amps. I have a MKI Decolonizer and Mother and a MKII Decolonizer. The MKI amps were a bit more aggressive than the MKII versions are IMO but it might be kinda moot because he is currently only building the Mother, which is like a Hiwatt with an extra gain stage and some Matamp filtering stuff, and Earthling, which is more of the Matamp doom thing.
Hellhawks are Plexi/Model T kinda stuff. Decolonizers are modded Marshall with a switchable gain boost on the lead channel.