Shed for Pulsar portable generator

I purchased the shed and generator from Sam's Club. The generator is a Pulsar PG12000B dual fuel generator that produces 12,000 peak watts/9,500 running watts on gasoline and 10,800 peak watts/8,550 running watts on propane. The shed is mounted to the base which is made from treated ground contact 4"x4"'s and treated 2"x6"'s, that makes it easy to move the entire thing with the pallet forks on my John Deere 1025R tractor. The exhaust, fan, vent, and solar battery charger were from Amazon. After cutting the holes I filled the cavities with fire block expanding foam.

I have an electrician coming to install a 50 amp outdoor hookup along with an interlock in the panel. They are also installing an Eaton whole house surge suppressor. I am still deciding on either a cold start or warm start kit for the central air to lower the startup amp draw.

The smoke is from the coating on the flexible exhaust pipe, it burnt off after a few minutes.

The investment in the generator setup so far, not including he electricians part, is about $1,650.00. The electrician is charging $550.00 for his part so all in it's around $2,200.00 . The cold start or warm start kit for the central AC will add another $35.00 - $300.00 depending on which way I decide to go with it but I have some time to decide.

Here is a list of the parts used with links, prices current as of publishing:

Keter Premier XL 41 cu. ft. Horizontal Outdoor Storage Shed ($199.98) - https://www.samsclub.com/p/keter-premier-xl-41-cu-ft-horizontal-storage-shed/prod23950341

Pulsar 9,500/12,000-Watt Dual-Fuel Electric/Recoil Start Portable ($899.00) - https://www.samsclub.com/p/12000-9500-watt-dual-fuel-gasoline-propane-electric-generator/prod23230490

GenExhaust Universal Generator Exhaust System Double Layer Wall Attachment for 1" ID Steel Flex tubing ($96.25) - https://www.amazon.com/gp/product/B07HGK4MV4/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1

Walker (40000) 1" Diameter - 25' Galvanized Flex Tube ($36.02) - https://www.amazon.com/gp/product/B0027IU9UY/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

Heavy Duty Saddle Style U-Bolt Muffler Clamps with Anti-Rust Coat and Multiple Uses (1 1/8") ($6.25) - https://www.amazon.com/gp/product/B01M3UHT38/ref=ppx_yo_dt_b_asin_title_o07_s01?ie=UTF8&psc=1

Permatex 80335 Muffler and Tailpipe Sealer, 3 oz. ($5.99) - https://www.amazon.com/gp/product/B000BOAZM8/ref=ppx_yo_dt_b_asin_title_o07_s01?ie=UTF8&psc=1

Sunway Solar Car Battery Trickle Charger & Maintainer 5W Solar Panel Power ($33.29) - https://www.amazon.com/gp/product/B07W97ZBXT/ref=ppx_yo_dt_b_asin_title_o01_s02?ie=UTF8&psc=1

GTIWUNG 16AWG Quick Disconnect SAE Cable, 2FT Ring Terminal Cable ($8.99) - SAE to O Ring - https://www.amazon.com/gp/product/B0894P79J6/ref=ppx_yo_dt_b_asin_title_o01_s01?ie=UTF8&psc=1

iPower 12 Inch Shutter Exhaust Fan Aluminum High Speed 1620RPM, 940 CFM ($59.99) - https://www.amazon.com/gp/product/B07VFT1S4N/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

Air Vent Cover with Built-in Pest Guard Screen 6"x6" ($9.95) - https://www.amazon.com/gp/product/B087GCCKMN/ref=ppx_yo_dt_b_asin_title_o01_s01?ie=UTF8&psc=1

ClearMax 50Amp RV Extension Cord with Ergonomic Handle ($99.99) - https://www.amazon.com/gp/product/B089J597X9/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

Whole House Surge Protection Contains CHSPULTRA and CHSPCABLE Devices ($155.71) - https://www.homedepot.com/p/Eaton-Whole-House-Surge-Protection-Contains-CHSPULTRA-and-CHSPCABLE-Devices-CHSPT22PACK/301051811

I also use Star Tron Enzyme Fuel Treatment Concentrate in the gasoline ($14.10) - https://www.amazon.com/gp/product/B00D3IEIFO/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

And about $30 dollars worth of stainless steel fasteners from the local hardware store.