Ok, for bracing under the door I'm thinking of a 2x4 running horizontal and resting on the jack studs. And then have a 2x4 running vertically 16" OC on the bottom, like the top.
I'm guessing the door can just sit on this 2x4 running horizontal.
For the pipes, I'm guessing I can use a hammer drill to drill holes in the cinder block for the pipes. I haven't been able to find a "safe" maximum hole size though. The cinder blocks are supporting a load bearing wall. I need 2 holes for the water pipes, 1 hole for the DWV, 1 hole for the heating vent. I'm assuming if I space these out over several blocks I should be ok but I could really use some advice.