You'd have to check some part numbers, but I think the '00 rear brakes would work on a "narrow" housing 8.8 if you used the 94-98 5-lug axles in there. The offsets between the housing and axle flanges are the same, so I don't see why not. (Narrow 8.8 housing means any Fox Mustang 8.8, as well as the 87-88 TC's and the 94-98 V8 cars)
There is a build thread on the car, but it is 15 years old on here, and isn't even the start of things. I've had the car since '96 and have been messing it up ever since.
The short version of the suspension is: Front - Stock K-member with altered roll center geometry (control arm locations) - FMS C-Kit springs with about 1/4" of spacers on top. - Koni Reds (Tbird-specific) - Stupid extreme CC plates I made myself -33mm sway bar Rear -A pair of old Kenney Brown LCA's I made up when I was there -A hodge-podge of semi-custom built un-splayed RUCAs with a modified Steeda panhard bar set-up, with lowered pick-up points at the axle -96-98 Mustang Cobra convertible rear springs (I need to change these out as the car needs a bit more roll stiffness in the rear) - Koni Reds (Tbird-specific) - 25mm solid SN-95 rear sway bar.
Brakes are SN-95 Cobra stuff front and rear. 94-95 spindles. TC 8.8 with SN-95 axles.
I'd go SN-95 stuff over Fox for brakes, all day, every day. later 2-piston 11" front discs are a nice upgrade.
The only issue to keep an eye out on that '00 rear axle. It's ~1.5" wider overall than the Tbird/Cougar one. If you'll still have enough room for your wheels, then you should be fine using it.
99-04 Mustangs also used 14mm hardware on the RLCAs, vs the 12mm on the Fox stuff. I know you can fit a 1/2" (12.7mm) bolt through the stock Tbird bushing sleeves by grinding down the little nubs inside the sleeve. Not sure if there is enough to fit a 14mm one through. You can't swap RLCAs, as the Tbird ones are longer.
Got the old fans out today and sure enough, the DS one is dead.
I have a bunch of Volvo fans here, so I thought I'd test fit the shroud to see if one of those would work. Actually would fit pretty nice...if the IC tubing wasn't so close to the bottom of the core support. Looks like I'll need to sort another option. (Plus side, it looks like this Volvo fan set I have will fit the LTS, seeing as there is no IC plumbing in the way)
I'll see what I can dig up, but probably won't mess with it much the next couple of weeks, as we're heading on vacation next Friday.