https://my-summer-car.fandom.com/wiki/Inspection_receipt has a precise list for the non-experimental version.

Few comments/ideas:

• Using Ferndale is not viable anyway since in the latest version Fleetari only gives the keys to it only when Satsuma is close to his office (so the Satsuma body would need to be towed with Kekmet)
• It's actually 100% safe to kill the wasp in Ruscko with the fire extinguisher during daytime, as the fire extinguisher range is 4 units and wasp attack range is 2 units.
• It's probably possible and beneficial to make the tire order from Fleetari before the rims are brought to him, since the game checks for their presence only when the order timer runs out (random between 23-43 minutes). Then you don't need to sleep and potentially save at Fleetari's place to wait for him to open and don't need to bring the toolset.
• Looking at the game scripts, the inspection process still doesn't check for any engine parts, but it does check that wiring of some parts is installed. Thus installing some parts of the engine might be required e.g. for the battery terminals to show up (I need to take a closer look at this)
• Not sure the money from the gift is actually needed? I watched a speedrun of this a week ago and I don't think he picked it up (though he used the boat thus no need for fire extinguisher)