Can you share some info on that outdoor sink?
And I also settled on using the Laveo Dry Flush for my build. I've no issue installing a blackwater tank, but when I first saw those I was sold (I had an RV once and am all too familiar with dumping stations and been using a little camp toilet in my current build as a placeholder...I'm done messing with sewage, LOL).
For the sink, I built a frame around it to attach the faucet and mount push-to-open drawer slides. The faucet is a 360 degree, folding design that lays flat when the drawer/sink is closed. I used an Ambassador Marine drain with a 95 degree drain angle to provide enough clearance to slide open. The drain hose is for a dishwasher and the faucet connections are the SS braided hose.
It was challenging to make the sink fit in such a small space and I wish I could have fit a bigger sink, but it's still very useful every time we're out. We use it for filling the dog water bowl, washing hands, hot water basin for scrubbing dishes.
On the Laveo toilet topic, we were able to use it on a weekend trip and it worked great. The emptying was an extremely easy, 30 second task.