W58 Bellhousing to 1UZ Adapter

[UZTODD]

I came across this thread (below) and was wondering why no one makes a adapter like this, only maybe more refined. Is there a downfall to utilizing a bellhousing to engine adapter?

http://www.driftworks.com/forum/dri...pra-1uzfe-manual-gearbox-adaptor-plate-2.html

 

[4U2QUIK]

because it costs a lot more to do for one.