Well, this is as far as I have got with my MK1 design to date.
It's coming along slowly but surely.
Not got a weather station right now as it had to be returned, so I'm using a low cost TFA temp sensor for now. I have normally been seeing about .5 degrees lower than a fairly nearby airfield most of the time. It's almost always at least 2 degrees lower than the Fine Offset I have just returned, biggest difference I saw with that so far was 6.1 I think, but I wasn't looking for much of a comparison with it though, as it was clearly not right in quite a number of ways! Hoping to see another station here in the next week or two with luck.
I'm presently working on a dual sensor mount for this screen as I plan to keep the TFA unit in place and add the new one. The TFA is 868Mhz and the new one will most likely be 433, I'm hoping that the two won't clash too badly.