From my understanding these are the differences:
x) Base body wood (ABI - Alder, ABII - Chambered Walnut, ABHS - Bubinga, ABZ - Swamp Ash)
x) Paint finish (ABZ - Open grain satin, all else are gloss)
Standard options for *all* Afterburner models:
x) 5-piece Maple neck with wenge fretboard
x) 2 x FD3 pickups
Upgrades for all models include the following:
x) X-top
x) Wenge neck
x) Blacked out head and heel
x) Upgraded fretboard material (Birdseye Maple, Ziricote, etc.)
x) Fretboard inlays (blocks, ivoroid, painted, etc.)
x) Pickup upgrades (3x, P-tone)
x) Darkglass/Glockenklang electronics
x) Pickup toggles
x) All kinds of paint options
The only real model specific upgrades are a swamp ash body on the ABI and a figured bubinga top for the ABHS. All of this information is based on the price guide and ordering process I've been through. As you can see the ABZ (and all models) have a lot of options available. I'm sure Sheldon and crew can work with you on other things but this at least gives you an idea of what you can mess with.
The ABZ also has the "squarish" pickup shells, whereas the ABI/ABII have the rounded shells. Or at least this was my understanding when I ordered, although I've seen 6-string models since that have been called ABZ's with the rounded shells, so...who knows.
Sheldon mentioned that the square shells were cheaper for them to make, so likely the original intention behind the ABZ series was for them to be a cheaper starting price point compared to the ABI, hence the difference. Then everyone kept coming along and customising the hell out of them, so it's blurred the lines a lot. The factory is currently testing new ways to make the rounded pickups which might change this again...so....who knows
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