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Im thinking about marinades and meat rubs!

Oh yes! Mix this with fresh course pepper and put it on some fish :)

First of all: I love the idea - thanks for sharing it with us!

My idea (I've only done this with raspberry and strawberry powder, and with powdered cinnamon, but I'm sure it also works with lemon powder because why not?):
Take 2 cups of granulated sugar, add about 1 or 1 1/2 cups of oil (e.g. jojoba or olive oil), and some lemon powder and you've got the perfect sugar scrub!

sugar scrub for bathing? That may sound like a silly question but I've never heard of a sugar scrub LOL

For showering or washing. The sugar crystals will removes excess skin particles (the dead ones) and makes the skin smooth, the oil will moisturise the skin - and the lemon powder will make the whole thing smell just amazing and perhaps even have a mild antibacterial effect.

Oh nice. Since the sugar is the exfoliate, I wonder if it can be replaced with another substance? Are there additional benefits to the sugar?

None that I'm aware of. I think it's neither beneficial nor detrimental to your skin.

Table salt is a good replacement. Sugar works fine, too, though. I suppose the replacement could be more or less anything with a crystalline structure that isn't toxic, but I'm most familiar with recipes containing either sugar or salt.