3M key holder

This is a key holder with 4 hooks and 2 shelves for your keys and small stuff like a wallet/sunglasses/etc.
First I designed it a single piece, but supports took a lot and I reworked it to an assembly.

I've printed it with different layer values. The base was 0.3, shelves and hooks - 0.1 to make curves smooth.
You might need a bit of sanding to fit inserts into holes, but I could assemble it without sanding.
Joints are strong even without pins, but I'm not sure how durable is that, so better to use them.

You'll need:
* 3M 5 pounds hook (see image) x1
* base x1
* shelf x2
* hook x4
* pin x16

I'm not professional in design and this is the first project I share. So I'm open to constructive feedback if you have :)