A skyline sedans only good for wristies or gobbies, both are possible without the sedan. Simple logic suggests having the sedan is redundant then, not to mention the brake light issue.
Relatively cheap changes to get you leaving the line better. Roughly every 0.1s you can reduce the 60 foot you will be 0.2s faster overall. So if your 60 foot is terrible as it sounds like it is, you can gain a lot by sorting that out.
If you don't have 4wd you can't just dump it. Gotta be mean to the clutch. Mickey Thompson et streets if you want to get off the line faster and a pair of rims to stick them on if you can't swap tyres cheap/easily. If you can soften the rear it will help and or get some subframe bushes from Lachlan if you don't have aftermarket ones to help it squat.
I have some solaris boxes running storage, they are really solid for uptime. I had one half crash, the local ui was completely unresponsive and you couldn't SSH into it but it keep serving up data flawlessly until it could be rebooted.
I installed windows 98 se on a gigabyte iram back in the mid 2000s. Amazing bootup speed. Took about 19 seconds from power button press to desktop, and about 15 seconds of that was the bios, This was before you could get an ssd.
You can download a tool to create the install media for you from Microsoft. It would not have all the drivers etc for the laptop on it though. You will need to download and install those from the manufacturer website. https://www.microsoft.com/en-au/software-download/windows10ISO
Windows 10 is different, it doesn't have a sticker as all the licencing is done via digital fingerprints of hardware, so you don't even have to enter a licence key it just checks your machine vs a database and says yes/no.