Looks OK, have some comments on it though:
1. 121? Your diagram shows 121 orbital going to port 4, yet the 1000 or 1000.2 dish is 119/110/129. If you are trying to hook up 121 FSS from an old Superdish, the the diagram is correct. If you are trying to hook up 129 from a 1000(.2) dish, it should really go to port 3 not 4 as it is not an FSS satellite.
2. Good job on hooking up the power inserter to the single tuner. This will provide more stable operation if you feed a TV2 signal to another TV through diplexers from the Dual tuners. I see on your diagram that the power inserter is connected to port 1, which is correct as well.
3. Although the specs. indicate that a 1000.2 LNB or DPPlusTwin wil work with a DPP44 switch, it would be best to use DishPro LNBs with the switch (either a DP twin for 110/119 and a DP Single/Dual for 129, or 3 DP Single/Dual LNBS, 1 for each orbital). If it is truly a 1000 dish, you will already have the bracket you need for this. If it is a 1000.2 dish you will need a "W" bracket.