We are doing a custom 3 link mid arm front on a D44. We cut off the UCA mount from the top of the front diff & add a custom truss, then add a control arm mount to the top of the truss which ends up being pointed to the mid arm upper mount on the frame end. All the frame end stock control arm bracketry gets cut off.
On the passenger front, you no longer have an upper control arm, so we add another lower control arm bracket since the stock one gets removed, and we station it so that the arm lengths are correct as far as geometry is concerned. Naturally, geometry is checked on all arms, brackets, steering, drive shaft, track bar etc plus any clearancing that's needed.
We also remove the upper & lower front shock mounts and replace them with frenched-in Poly Performance towers & shock mounts.
For the rear - we remove all the stock control arm brackets from the frame, then get ready to do a rear mid arm as well. Add a truss to the rear diff, then get ready to do all the mid arm & rear 4 link geometry (upper triangulated - so no rear track bar). Plus french the rear frame and get ready to outboard the rear shocks and do a rear coil correction as well. Plus a bunch of other interesting stuff.
There's often at least one if not both axles getting regeared/swapped etc at the same time too - so setting up brackets on those is often part of the overall picture too. Throw in a tranny and/or tcase swap in the mix too if necessary.