Body drops? Z-frame?

[yotaforce]

Anyone have their 67-72 body dropped or their front frame/crossmember Z-d? I am looking to get the cab dropped down a bit to level it with the bottom of the frame, and Z the front end to get the crossmember up to the same level. Then bring it all together with an air suspension. The bed floor and rear frame will all be easy and quite simple to fabricate. I'm just curious if anyone has modified the cab floor, or just build a new floor and tunnel.