Thomas........I'm sure that DWBH, socks, and penworks could give you a detailed accounting of these questions better than I can, but I'll take a swing at it.
Why didn't wierwille have way builders build dormitories at hq? ................When the Executive Office Building (EOB) was built in 1969/1970.....upon early construction, it WAS slotted as a dormitory. That's why there are separate men's and women's shower rooms in the lower level of that building. The bedrooms were upstairs. BUT......midway thru construction, twi was growing at a significant pace and the "dormitory" was redirected as an office building for the growing staff: walter cummins' office, legal, finance, outreach and later, computer services that took over the west side of the building.
Trailer park for staff residences? .............. Many of the early staff lived off-grounds and commuted from nearby towns. Again, I'm sure that DWBH, socks, and penworks could give lots of specifics on this.......but solid-down-to-earth staff like Hearnes, Bowens, Skapuras, Shroyers, Gluckins, Raths, Wilsons, and lots of others lived in the surrounding towns. There were staff residence homes/units near the BRC for the top-tier loyals........Howard Allen home, Ermal/Dorothy's unit, George/Bernita Jess' unit and the "original" corps unit which housed like six men on one side and six women on the other. BUT......when the 4th corps were inbound for in-residence, wierwille sent out a directive for them to secure housing via a trailer unit (??) placed out back that would be accommodated with electrical and plumbing services. Socks made reference to this at one time.
Purchasing Emporia Campus and Rome City Campus? ........... Twi came to a major decision point when the 6th corps registration numbers came in: 325 people wanted to enter the corps indoctrination program. That was a figure that more than quadrupled the 5th corps number of 75. There was NO way that twi was prepared to have 325 in-residence corps at the way international: not enough classrooms or break-out rooms , cafeteria space, or workload where staff was already doing this work. This was 1974, heading into 1975. Thus, the purchase of the emporia campus ushered in a whole new scale of "work projects" as well as ample classrooms and dormitories. Twi put up the 147-acre property to leverage the purchase. The Rome City campus was for Family Corps.....as it was mainly "under one roof" and allowed for corps and children ample space.