For later grows I will definitely do this (or something similar). It's been a relative pain relying solely on the themostat to try and heat the room up as much as possible (not to mention costly). I'll see if I can find something like that for later flushes. When I'm moving on to PF tek, I will definitely take the time to build a good incubator (which I guess works like you described). If you have any experience with a shotgun fruiting chamber, what would you recommend to keep temperatures in the ideal range? I've read that you really shouldn't heat a shotgun FC up and that it works well in room temperatures, but where I live room temperature is around 17-18°C, which is just too cold.
Alright, important update today 
The largest shroom of them all took a big spurt of growth today, increased quite a bit in size while I was at work today, and the cap seems to be opening up.
However, none of the other ones have shown particular growth, they seem to be roughly the same size as a couple of days ago. They still look pretty healthy and most of them have big clumps of fluffy mycelium around the base of the stems, so I don't think they will abort yet. There are a bunch of clusters that have yet to grow. I guess the big one only needs a little bit longer (possibly tomorrow) before harvesting, is it okay to just pick this one mushroom and leave the others so that they too will hopefully grow? The mycelium at the base of the stems seems like a positive sign at least, the largest pins seemed to grow faster once this appeared, although these little ones had already developed it around 3 days ago, and have since not grown at all it seems. Would picking the big mushroom have an impact, in the sense that the mycelium will start to focus its attention on developing the other pins now?
Quite a bit of the smaller ones show blueing at the stem, some even on the cap. The information I've found is very conflicting, ranging from dried out substrate to swamped substrate, or the RH being too low. I skipped misting for a day and noticed pretty much no growth at all, and then I misted lightly yesterday evening and today again in the morning, and when I got back home this evening that one mushroom took a huge sprint of growth. I'll just keep misting good once a day, and fan 3-4 times a day, and see what happens I guess.
I have read that the psiloc(yb)in is developed in the early stages of pinning, so even non-mature pins should contain roughly the same amount as fully mature mushrooms (hence why most people agree that aborts are very potent despite their size and weight). I have read of many people picking their mushrooms when they are about 3/5th mature, since they are about equally potent and then more nutrients remain to benefit later flushes. Of course I would rather keep my grow going and hopefully see the majority of the small pins mature into beautiful fruits, but this fact helps keep my mind at ease should they decide to abort in the end.