It's not going to be inexpensive/cheap to put in the ventilation but it will be less expensive than the L&I claims and fines from OSHA. I'd start with the plans for the hoods and vents that the HVAC guys gave you and have them reviewed. It should solve the problem of the presses. But you may still have the issue of new construction smells from the carpets and paints to deal with. Maybe the HVAC guys have some ideas on central air/heating air filtration for the shop or a completely separate zone/system for the offices.
The views expressed here are my own personal views and are not those of my employer.