You don't really need any bells or whistles if the design is solid - the key is for everyone
else to dig your artwork
The rationale behind stretch goals adding features like this is to help guarantee being able to produce anything at all at the basic goal. the more that's pledged over that amount, the more features you'll be able to afford to add.
Of course some are a gimme and you KNOW you'll get them, but that gives a project impetus - those that pledge feel they are getting more for their money, are more likely to plug your product FOR YOU to get to that next goal. It gives your customers a sense of achievement - and the better they feel the more generous they will be.
It's psychology and game theory 101 - and it's basically win-win.
Of course there's no reason not to jump in with all the shiney shiney and have extras like display cases, chips and so on - but you are relying on people wanting those things and having pockets deep enough to afford them (and ship them - NOT a trivial thing when you can expect at least 20% of your customer base will be overseas)
Basically I'd say you can't polish a turd, but you can overdress. A good design will sell anyway, and the extras will simply enhance what's already there...
So, with that in mind show us what you have - I'm ready to dig
