Both of our indoor ranges just went through major renovations. It took awhile because they looked similar to your images. They upgraded the ventilation systems, improved bullet traps and added more sound proofing and electronic control panels. Both are certified to do LEOSA and provide the...
Use the Challis o-rings to reduce torque required on the screws. Order directly from Challis for a better price than other sources. He also has a selection of screws but not oem style.