Oh, nothing much...
Temporarily mounted a GT1752 (I'm pretty sure that's what it is, but I haven't gotten the numbers off it yet...) to the stock manifold, and checked clearance on the engine with it.
I'm probably going to need to cut off a head-side flange from another manifold to get the extra 12mm or so of clearance to make everything jive correctly, but seems like it'll work fine without re-clocking the housings at all. The oil drain won't be perfectly vertical, but it shouldn't hurt anything at a slight angle (less than 10*) since it's such a large diameter (something like 20mm).
The rear two bolts on the manifold, after removing the studs, accommodate 2 of the studs on the GT28 flange. Knowing this beforehand, I have only mounted the turbo by 2 studs, and plan on welding some material to the remainder of the flange to accommodate the other 2 studs. The turbo sits canted away from the engine on the cold side as a result, but this should not affect anything, since there should be plenty of clearance to the radiator here.
I will not be running an IC for this any time soon, if at all, since I'll only be running it at about 5 PSI on the B3. Later, if I decide to turn the boost up, I'll have a buddy make a PWM circuit based on a pressure switch to control water injection and an auxiliary injector for when the stock ECM can't handle the boost level.
Next things to do are grab a spare oil pan (from the first engine in this car) and get it ready for an oil return plug, figure out where to draw oil from, and pipe it up on the mock-up engine. I'll probably plug the coolant ports on the turbo since they won't be necessary at low boost. Again, if I need them later, they'll still be there.
So... that's what I done tuhday. What'd YOU do?