The lower ball joint nuts take a 27 mm wrench or socket for the OE ones. Its possible that some after market ones could be different.
I have never had to break the lower ball joint loose to R/R an axle shaft. Didnt even remove brake caliper when I swapped out the broken POS EMPI unit on the trail near Tuscon a couple weeks ago. Just loosen 36mm axle nut, remove wheel and tyre, put bottle jack under lower a-arm, break tie rod end loose from knuckle, remove lower shock bolt, remove upper a-arm pinch bolt, remove small bolt (10mm head) holding brake line to upper a-arm and release bottle jack to lower assembly down. Tip knuckle out and rearward to wrestle axle stub out of wheel barren. Do this before popping stub shaft from diff unit . After replacing seal ,reverse to install. Oh and be carefull with ABS wiring.
I have considered removing about .250" from each of my axle shafts to facilitate easier removal and installation.
As far as your steering rack bolts, 24mm is correct. The listed torque value for these is something like 97 ft lb. I use blue locktite and tighten them closer to 150+ using new OE nuts as I have had them come loose after replacing my rack at the factory torque value. Last time I replaced bolts also. Passenger side rack bolts are 15mm heads and I locktite them also.
Steering rack is super easy to swap out. I remove one complete tierod assembly ( inner and outer ) to make it much easier. The boot clamp is reuseable if you are carefull.
Brakes are easy.Just be sure you get new slide pins with pads as corrosion gets these stuck. Also make sure all 4 caliper pistons glide back in with no sticking and that none of the piston boots have holes in them. Any sticking or holes and its time for a reman unit as you will have trouble down the road. Its also a good idea to open bleeder on caliper when pushing pistons in so dirty fluid does not go back to power brake unit and possibly plugging something up.
If you lived here in Phoenix I'd say bring it on over and we would have a good day wrenching. I love doing this type of stuff with fellow offroaders.
Good wrenching.