I kinda love the enormous base kit, but I do think that the novelties should be separate, or massively cut down.
Also, if you're putting 2x3U bars in base, I'd say it's probably worth putting a single 1U bar in there too.
Initially I thought going for a custom white was probably not the best idea, but having looked at it I see that there isn't really a similar white in GMKs stock colours. To me it looks like a slightly dimmer WS1, but not edging into cream like CP?