I expect this guy will be looking at reliability data for various components, popular aftermarket upgrades, etc and designing a drivetrain that already uses popular components known by the automotive community to be reliable. Otherwise he will have a hard time hitting the 500k mile target I think I saw on the site.
He needs a dependable I4 engine mated to a dependable 6-spd manual transmission, mated to a dependable transfer case that sends power to the wheels through dependable differentials. I bet one could pull data from off-roader forums and configure something in a couple of days for their marketers to build interest.