I finally found out the weight of a couple of different Subaru transmissions for comparisons with other engines and their intended transmissions. Especially for the Subie, using a transmission designed to bolt to the engine saves a ton of work.
Anywho, what I found out was the 2002 5 speed weighed in about 135-140 pounds, the later model 6 speed was 155-160, and the automatics were about 200-210. Also removing the front drive differential and drive shaft and welding the center diff solid took about 35 pounds off when converting AWD to RWD. So for the normally aspirated 2 liter engine bolted to the 5 speed with the front diff removed we are looking at an all-up weight of about 300 pounds and about 200 HP, to 460 for the 2.5l turbo bolted to the late automatic with the front diff propelled by 300 HP. And those power numbers are factory ratings, tuning for higher octane can raise those numbers considerably especially for the turbocharged engines that can refuel with E85 and really crank the boost.
And thinking about this kept me awake most of the night and caused me to wake up way early, after only 4 hours of sleep. I need to go back to bed now. Except I need to clear my inbox before I sleep.