I think your changes are really nice. I haven't used the LDD before but it has pretty good specs and is cheap for a commercial driver. The plug-in capability is really cool, making for a nicely integrated unit vs. having a sloppy mess of wiring. The Typhon was a good achievement in some ways but it really fails in other ways - ease of integration being one of them. I definitely see this as an improvement in that arena.
Can you show some photos of the board with the components removed or post the EAGLE files? It looks like the design is all SMT?
What would be really nice would be to take this a step further. Integrate a voltage reg that could step down the LDD's source DC to something the Typhon hardware could use, to eliminate the separate power supply.
How are you finding the LDD's? It looks like they only go up to 1A which kinda sucks if you want to push XM-L or even XP-G.