I do have parts left over from when I put a Bradley turret on a Sherman hull! Mix and match like ericr does.
Given that the Bradley hull has a large enough opening I suspect there are other possible options to consider for swapping such as the gun tub from the M42 Duster to create an SPAAG based on the Bradley hull.
***Edit to note that the Part 5 WIP video link has been added to the original post.--jjf