going for a custom slot is easier (given it works softwarewise, which it did before this drop). and i take every order that gets in, also the oversold ones. contrary to this i cannot fulfill the oversold orders on prebuilt units since its physically not possible, however someone mentioned it before, if you get refunded twice you can get a custom build slot with increased building time. so in a way the custom slots are something between the prebuilt lottery and a 2 year+ waitlist.
personally i cant do waitlists and therefor i can also not support having a waitlist for these products. not speaking of the admin effort of managing a waitlist (i started with one). so this is the system i chose. i am sorry if it is frustrating for you but thank you very much for the interest!