Well, good luck...
I also have a 29.5. Luckily for me, the bearing is still in decent shape. One thing about a 29.5...at least on mine (1994), the strut is molded right into the hull. I had replaced the cutlass bearing on my old h27, and though it was a tough job, it was easier with just the bolted on strut. I am guessing that the job becomes VERY complicated with a molded in strut, as you can only "slide" the bearing in without the use of a C-clamp. These bearings are VERY fragile with regard to putting any kind of force (pounding in, or c-clamping or whatever), so, yes, the yard may have screwed you over, but, maybe not due to the complexity of the bearing on a 29.5. As far as the mixing elbow is concerned, unfortunately, I can't help you...good luck though...