So, after it's first use, how did my new set up perform?
Firstly, the mash tun worked pretty well. There were a couple of issues with the manifold I need to address. It is only a loose fit into the tank connector and when the cooler was full of 4kg of grain and 12L of water, the sides bulged out just enough for the manifold to disconnect. This meant I had to empty it, reattach the manifold and lash together a support for the tap to stop it popping off the connector again, before refilling the tun. All this faffing dropped the temp of the mash and buggered up my efficiency somewhat. The slots in the manifold also led to a really slow sparge of about 1L every 4 minutes. So I'll be cutting a few more. Lastly, the lid got quite warm so I'll be insulating that as well. But for a first try, I'm pretty happy.
Secondly, the boiler worked very well. A bit too well in that it had a massive boilover which came up incredibly quickly. I've only had time to print one element cover and thankfully managed to yank the plug before it got covered in how wort. The other one, with the cover, got drenched as well, but the cover worked brilliantly. I'll be offering these as cheaply as I reasonably can to other members as soon as I have design sorted. It's such a big safety issue. The pick up on the bottom of the boiler didn't work all that well, and didn't ever get a steady enough flow to syphon the bottom of the vessel properly. I'll see about modifying it, but I may end up whirlpooling and then racking if I can't get it to work.
Lastly, I'll be building an immersion cooler before my next brew as it took forever to cool.
Overall, I was pretty happy.