Just finished watched T2 to refresh my memory and figured I'd create a list of what would be required to make the ultimate BD T800. I'm putting this in here as I think it's more likely Hot Toys will include the most with their version seeing as Enterbays being at 1/4 scale is gong to be expensive enough as it is.
Ok to start off with is the end of the Cyberdyne scene;
Partially BD headsculpt
Partially BD upper body/T-Shirt & Jacket
BD to left knee
BD gloves
Steelmill scene;
Fully BD headsculpt (hopefully with a LED right eye but that may be pushing things)
Fully BD upper body/T-Shirt
Separate BD left arm
Same level of BD to left knee and gloves
Accessories needed would be would be;
Pistol
M79 Grenade Launcher
Gas Launcher (not sure of the specific name but it's used after he's got BD at the end of the Cyberdyne scene)
Steel pipe
*feel free to add your own suggestions to the list as I'm sure some Terminator experts will see some glaring omissions
Looking through that list I guess really Hot Toys could really provide it all without any problems, the varying levels of BD to the upper body could be a problem but if it is I doubt anyone going to throw a hissy fit if they did just provided him with one level of BD to that area (they could do both just by providing two different T-Shirts). They've done removable arms with at least 2 Ironman figures so there shouldn't be any problem doing the BD left arm I wouldn't have thought either.
Anyway just wanted to put my thoughts down on paper so to speak