Hmm. To me this looks like a perfectly usable case.
Of course you could go larger, or get a bigger case so you can grow more. But this isn't a bad build by any means.
You've got everything you need to make a good subtractive synth voice, with a backup voice that can be a bass-line or drum AND a chordy pad voice. With effects and a decent amount of modulation. And you can load basically anything you want into Nebulae. I'm not sure exactly what Garfield is getting at.... but I do agree that picking a sequencer is a highly personal thing - and that you really want to be sure you 'gel' with the choice as you often build around that.
Most of all, have fun! This case still looks pretty fun, so you'll be OK I think.