I think the right way to go is fine a good local computer store with knowledgeable people and get their help parting out and assembling it. You get some repair coverage and benefits like that, they do the bulk of the work, and you can put your own options in on anything you’re knowledgeable about. It’s what I’ve done and it’s well worth it for the small extra cost.
In japan they put the handwashing sink on the back of the toilet. It’s smaller, smarter, and doesn’t look weird and gross like this.
Then they brush their teeth in a different room so their toothbrush isn’t two feet from their shit.