You have as many tools as me! So you can do ANYTHING
As far as the bukhead base piece the re-enforcement was inevitable (cracked welds anyway) I took a piece of bigger tubing ,sliced a 1/4 section out of the length and laid it over the original frame as re-enforcement. Find the threads about using 1/2" heims for ball joints and that task will be out of the way before the others fail and cause injury to the occupants or the buggy. Find some grade 8 bolts the same size diameter (I believe 3/4") as the spindles only 3" longer. Cut the original ones off. Now drill thru the square tube on the spindle and set the new bolts (2 points of weld now and longer to get the wheels away from the frame alittle more for better turning radius.I relocated the rack-n-pinion to get a better travel on the steering arms and filed 2 more grooves to each side of the rack unit for a really good turning radius(down side to this is it will roll over easier with the stock axle width). There that should take you a few hours!!!!!!