The "aces" of HDT renovation & rebuild... check Jack's project on the SKP forum for HDT.
Larry Herrin (also, in TX) does outstanding bed & DROM work -- he's SE of Dallas, opposite side from 2L's shop. IF you can locate Phil Carpenter (and view his rig, that's the way I'd go); not taking away from Wayland, his shop is more of a turn-key (spell that with $$$), and there are many satisfied customers here (and on SKP forum). Phil has nearby contacts for the HDT renovation/preparation work you'd want to do before adding the bed (ie, single-out, replace shocks, bags, airlines before covering them over with a bed).
Greg Shields (in OP) at RV Haulers in Canada does amazing work, did the reno. work for Jack; he's probably gonna start doing some smart beds (like the "big yellow truck"?)... which will make him more like a one-stop-shop.
Don & Fannie
2005 Volvo 670, 2005 smart fortwo 450
2007 Summit - 35', 2 slides, 2' BR add-on (VIN # 746)