Just a couple comments ...
With a heavy engine you do have to worry about the springs. Mine have a couple leafs pulled and mine are deforming.
[IMG]DSC01849 by , on Flickr[/IMG]
The springs were ok for the first year or two but I started to notice them saggin. This is with a 7.3 so its a bit of a heavy pig but not much lighter than the v10. The rest of your drivetrain is going to be heavier than what I'm using so it will be pretty close to what mine is in the end.
I used the stock crossmenber from the donor truck, just welded a couple bits of angle so it can rest on the top of the frame. I have it bolted in from there. Makes taking the engine out and returning it very easy and uncomplicated. The engine was installed and removed many times during the course of my build and this was a really nice feature. I don't have any good pics but you can see a little of it in the pic above.
If you want I can get a couple good pics tonight after work.
Keep up the good work.
Paul
1967 M715 7.3 diesel 5spd ...