Sure, there's always SOMEONE interested. If you are talking a Subie engine in a Boxster, I'm sure there would be more interest than the other way around. Are you gonna try a WRX motor or a Legacy H6 motor? You would probably have less trouble with a 3.6R swap as you would not have to worry about intercooler placement. Either way, it sounds like it will be quite the project. Keep us informed.
I'm a "purist", but I think a swap like this would appeal to a number of folks out there as an inexpensive alternative to a blown M96 engine. Plus it is a "boxer" configuration, so it's far better than some domestic transplant
__________________ JGM
2002 Boxster S
1973 911 Green FrankenMeanie
PCA DE Instructor circa '95