Observatory Construction: Planning the Second Pier

Before I begin building my observatory, I need to determine the placement of the second pier and the wall heights. In this video, I quickly—in the summer heat of Phoenix—figure out rough measurements for the second pier placement and the wall height. It doesn't look precise, but I added a few inches to compensate. I haven't done much on the build as it is the middle of summer here in Phoenix, but the plan is to hit it hard in September to do the build. It shouldn't take too long!

My Astrophotography Gear
Mount: Skywatcher EQ6-R Pro and Celestron branded Losmandy G-11
Pier: Homemade pier, yeah!
Telescope (wide angle): Apertura 75Q, F/5.4, 405mm FL
Telescope (long): Third Planet Optics (TPO) 10" Newtonian F/4, 1000mm FL
Telescope (A bit longer): Third Planet Optics 6" RC f/9 1370mm FL
Guide Scope: Skywatcher Evoguide 50mm ED, F/4.8, 242mm FL
Guide Camera: Player One Neptune-M (IMX178 sensor, monochrome)
Guide Camera: ZWO ASI 290MM Mini
Astro Camera Monochrome: ZWO ASI 2600MM Pro
Astro Camera Color: OGMA AP26CC
Filter Wheel: ZWO EFW 2" 7 position and ZWO EFW 2" 5 position
Rotator: Pegasus Astro Falcon Rotator
Focuser: ZWO EAF (on each scope)
Power: Pegasus Pocket Powerbox Advance Gen 2 and Pegasus Pocket Powerbox Micro
Flat Panels: Deep Sky Dad Motorized Flat Panel, Wanderer 190mm motorized Flat Panel, Pegasus Astro Flatmaster 150, and a homemade one for my 10" Newtonian
Software Control PC: Mele Quieter 3 and Mele 3 Overclock C

My Astrophotography Software
Mount control software: Green Swamp Server (controls EQ6r Pro mount)
Mount control software: Gemini 2 (controls G-11 mount)
Pegasus Astro device management software: Pegasus Astro Utility Platform (controls all of my Pegasus Astro devices)
ASCOM 6.6 Platform
Acquisition software: NINA (lastest version)
Guiding software: Phd2 (latest version)
Planetarium software: Stellarium (latest version)
Plate solving software: ASTAP
Plate solving software: Plate Solve 2 and Plate Solve 3 from Planewave