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Here is slight overview on the differences.
The 901 is not much bigger or stronger or heavier than a bugs tran, uses the same CVs and axles. The front mount is different and the rear is close to a bugs. Clutch operates as a push instead of a pull.
The 915 is a different animal. There are three different models and they are heavier, stronger and longer than a bugs. The clutch operates the same as a bug, but the cable goes into the bottom and not the top. The CVs are 930 fine spline and require custom axles to mate to a bug CV. The case is the same width as a bug. The rear can be modified to use bug mounts , but the front has to be custom.
Getting a trans with the right gear ratios is the most important item as they are very expensive to change. The clutch flywheel combo is based on the engine you use, however both require the use of a Porsche starter or an VW autostick starter (much cheaper with the same part number).
The bug shift coupler will bolt up.
Due to the differences in the trans I would say they are about same difficulty to install. I would rate it a moderate modification with welding and fabrication skills needed.
Michel Ghia's site has been very helpful.
My configuration is a 911/901 (915) with a padded offroad rear mount (so I would have some thing to bolt my Kafer bars to), custom front, reversed bowen tube clutch release, redrilled to 915 CV flanges, 914 clutch and pressure plate, thing shift rod bent to mate to the trans shift rod, and a Scat dragfast with modified reverse lockout plate to allow first gear with a locked out reverse. It took longer to run a new fuel line down the tunnel than it did to modify the trans. Hope it helps.
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