Aye Up Alan,
Good work, out in the sticks or in the back garden - the practices are the same (except the walk-in) and it does the kids the world of good.
We used to be a nation of campers/outdoorsmen/women, sadly less so these days imho.
Re the condensation - my old British Army 2 man tent had integral mosi nets across either end-opening (triangular shaped) with brass rings attached to a central, vertical canvas strip in the centre which you could run the guy line through.
This gave the option of having the nets down or pulling them up, blind stylee.
With a door flap fully or partially open at either end we had no condensation probs.
You couldn't as easily raise half the tent as you have done in your set up mind (looks very useful) as the mosi net was unbroken full width, but with a central vertical zip in the middle of the net that issue would be solved.
If you do go down that route, for a potential source of mosi net the Brit Army cot bed mosi shelters might be useful. You can pick them up quite cheap without poles now and again.
I humped that tent on top of an external framed Bergen around the lake District for several years in my early teens before joining HMF and it was seriously heavy especially when wet but it was the only one left standing one morning after gale force winds hit Coniston Old Farm site one night!
(Mind you the issued pegs were like marquee stakes!)
I wish that I had some phots of those exploits with the tent in it but alas they are all long, long gone.
I found this image of one on the web though which is similar - mine was olive green with olive green nets.
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