Government amounts in the current USCIS fee schedule, Form G-1055, paid by the petitioning U.S. entity, plus premium processing if needed. Engineering time to assemble the technical evidence, and travel between the two plants, are the larger internal costs.
Cost the evidence assembly as a project task
Hypothetical example: the launch schedule leaves no room for the engineer to spend a fortnight organising the development record, so it is done badly at the last minute. Put it in the project plan with hours attached. Budget for government amounts per the current G-1055 schedule; premium processing if the launch date requires it; immigration representation; the engineering and drafting hours to compile and explain the technical evidence; certified translations if any records are not in English; and relocation.
Add travel between the two plants during the launch and the cost of covering her Picture Butte work. Decide who pays for what and record it, because the pattern of payment is also evidence about which entity employs and directs her.