Since I started this thread in the powertrain area in error, here is more about the Xtrac 6012 gear box:
Click the image to see a listing of Xtrac gearboxes including other longitudinal transaxles, in addition to the 6012, which don't appear to be nearly as long as those found in Daytona Prototypes and might be worthy of consideration.
Here is a link to a much better version of the
6012 PDF than was posted previously.
Here is Xtrac's maketing blurb:
New '6012' Road Car Gearbox
Xtrac launched its ultra high specification 6 speed transverse transaxle transmission at the Autosport International Show held at the NEC in January.
The new gearbox represents an important commercial development for the company; building on our expertise in specialist race car transmissions the road-going '6012' variant extends Xtrac's business into low volume driveline projects for the mainstream automotive industry. Designed to meet the needs of vehicle manufacturers producing high performance vehicles, the transmission can handle an impressive 1,100 Nm (811 lbft) of torque.
The key benefit to makers of exclusive supercars requiring such transmissions is access to an affordable 'off-the-shelf' system, thereby avoiding the need for expensive upfront engineering development of a bespoke design.