Am I allowed to enter the printer giveaway twice or just pick one?

The two tracks are separate, so you can pick one or do both without them canceling each other out. Track 1 is where you describe a big project you want to print, and you need the tag Track1 Mega in your comment. Track 2 is a photo of your current workspace plus the #Track 2Neo tag and a few words on how the Neo would fit your setup. I entered both last time and the entries are judged independently, so doing both just doubles your chances rather than muddying anything.

For your idea entry, a rough sketch is fine. The rules literally say concept, sketch, or design idea, so nobody expects a finished CAD file. I've seen winning entries that were basially a paragraph and a hand drawing on notebook paper. What matters more is that you explain why the bigger build volume would let you actually pull it off. Something like 'I've wanted to print X but my current bed is too small' with the sketch attached is a complete entry. You could even write out your idea as text if drawing it feels like too much.

On the workspace photo, messy is completely fine and honestly a cat on the printer is more of an asset than a problem here. These entries are about showing your real creative corner and how a new machine would fit, not a showroom. I'd snap the photo as-is, maybe clear the worst of the filament scraps off the desk just so the printer is visible, and write a sentence or two about why the cramped corner is exactly why the smaller footprint would help.

Two things people get burned on: the tag has to match the track exactly, especally the #Track 2Neo one which has that odd hashtag placement, and the entry window is only open through mid November so don't sit on it. If your big project idea involves something huge like oversized props or builds that don't fit a 300mm plate, lean into that in your Track 1 text because that's the whole point of the Mega category.

Can confirm the judging independence part, I did both tracks last round and got shortlisted on the workspace one with a photo that had a half-spooled spool and a mug of cold coffee sitting right next to the printer. The messy desk angle actually helped my write-up because the cramped footprint was the whole story. One thing I'd add for the sketch track, mine was rejected the first try because I forgot to say what material I'd print it in, so throw in a line about filament choice even if it's just a guess.

For the sketch one, don't overthink the drawing part. Mine was basically stick figures on printer paper and it went through fine. I took a photo with my phone and attached that instead of trying to scan anything, way less hassle. Also if the cat's anything like mine she'll photobomb the workspace shot anyway, might as well lean into it. Quick thing I'm still fuzzy on though, do both entries need to be in seperate comments or can they go in one? I'd rather not guess and blow an entry.