The Secret Bunker v 3.0

It seems to be a typical shed at first sight. But is it? There is a hidden subterranean area below that is just waiting to be found. Locate the concealed trigger to open the slope that descends to a fully furnished workshop intended for those who want to construct the ultimate machine.
While the second room is still a mystery and will be used according to your choices, the first room is ready for usage. Can you find every secret hidden inside?

V3.0.0.0 Changelog: Complete Rebuild + Fixed Bugs
Adding new images and getting ready for the last Mclaren Project Phase (Phase 3)
Version 2.0.0.0
There has been an update on the Secret Bunker! 🔧 Have you been able to locate the hidden project and the secret door?
Your opinions would be much appreciated! Please share your thoughts and suggestions for the hidden chamber in the comments section below; they may be included in the next release!
Changelog: #8211; Bug Fix; Phase 2 Update for the McLaren Project; Added a few images

Thanks to RollerSIMModding