Surprised to see this thread pop up again.
After being unable to find a reasonable rolling chassis, I decided to transplant the LFX/6L50 into a 2011 hardtop convertible Miata. I chose this venue because the NC Miata could accept the engine and drivetrain with little to no body alterations. While others have mounted the LFX into Miatas with 6 speed manual trannys, This will be the first with an AT. Weight will be within 200 lbs of stock 240Z. Compared to the LS installations from Flying Miata that require serious tunnel modification, the bodywork for the NC model was a piece of cake.
V8Roadsters sells mounts, half shafts, drive shafts etc for the swap. They also sell a shortened oil pan, though it is not required for this installation.
So far I have the engine/tranny/diff installed. While the engine bay in the 240Z is enormous, the Miata was a tight fit. I had to slightly relieve (ball peen hammer) the firewall near gas pedal mount and trim some clearance on the passenger front frame rail. Also had to widen the tunnel to clear the shift linkage again ball peen hammer). Also had to remove a minor front cross brace ahead of the of the engine. Currently working on a new power steering pump bracket (version 2.0) and modifying the steering linkage to work around the exhaust downpipe.
Because of the tight fit and the water pump being mounted on the rear of the engine, I had to substitute the heater lines and radiator feed tube from a Cadillac CTS. Seems this engine has been used in a number of GM apps in both transverse mount and longitudinal mounts so lots of accessory parts are available.
Work is coming along.