I'd like to see where the HM is going to live and the cable routing, especially the seal into the cook chamber.
Basically in the same place as WBegg has his. I picked up some Halex connectors. They have a rubber fitting that when the connector is tighten compresses. Its not perfectly air or water tight with probes and the TC, but i can get it close enogh.
The cat5 and power supply will also be routed through a Halex connector.
I welded up the 6x6x6 area for the heatermeter last night and did some grinding this morning on it, it looks pretty good. I just need to take it into work so that i can get the holes drilled.
Hrrrm. I'd be concerned exposing a rubber seal directly to a 225-275 F cooking chamber. Wonder if I could find a sheet of the high temp silicon rubber...... here we go: https://www.amazon.com/exec/obidos/ASIN/B00XLVN5ZC/tvwb-20 I'd be really tempted to cut gasketing out of something like that instead.
And the more I consider this..... the pocket where the HM lives will have to be oriented roughly towards the WiFI AP, and the cover (if it has one,) has to be RF transparent.
My apologies.... in all of my nitpicking, I did neglect to mention that I am rather envious of your progress.... I'm starting to really look forward to building one of these some time around May.
The Halex connectors are used in high heat applications also. People use and also smoker companies use grommets in there smokers all the time, I had them in my uds. The rubber is a hard black rubber and will be safe to use in tempetures below 900°.
And a winter project may be in genesis..... multi-channel temperature acquisition to measure heat distribution. Probably 12 channels (okay, maybe 16,) rPi based. A coworker got me looking at bulk resistive temperature devices for only a couple of bucks, and multiplexed readers for them.