If your building a subaru engined car I see no reason to not go with a subie tranny 5 speed. I have 2008-2009 engine and tranny and the R&P is an australian product that reverse it. hey you get VSS, they line up perfectly no adapter, use Subie clutch and the CPU can be used to even get you cruise control, heck it is built in.
It works for me in a Roadster cruiser style driving car, and I have no LSD it is too hard on the brain and no TBD . The tranny also has the proper spacing in the gearing and you get to row 4 gears then get ODrive and It is not much more money IMO. If my budget was low I would add this at the expense of something else.
We all know that If your using a VW engine you need to keep the engine spinning at 3K to cool it ... so you are limited to cruise at 3K rpm at least in any cruising gear.
Danny that a spyder or yours is so light it can do well with a Type-1 but in a speedster I find a 3:44-1 is still a compromise as the 3rd and 4th are not spaced properly.
Heck what do I know 
but I was going to do a 915 or 901 tranny in my build but some of the used stuff available have been driven for many many miles and rebuilt a few times and hence the cost and availability of GOOD trannies may be an issue and add to the cost... so Big Money ... Subie is available at every corner store nearly.