Many thanks for the additional advice which I found useful. I managed to complete that mission; I found that the palace was essential to my victory.
The fist wave of attacks on my base wasn't triggered by construction of a refinery. It didn't happen until I had build a repair centre. I don't know if that was causative or simply a coincidence but attacks seemed to be aimed at that building. At that point I has also built wind traps (X2), radar outpost, refinery, small vehicle factory, silos and canon turrets (X3). I think that the large vehicle factory was the last building that I erected. It did cause an additional wave of attacks and was demolished once.
Eventually I scraped home with zero cash but a few units to spare.
Now comes the last mission. I've tried this three times so far without success. The problem with this one is that it doesn't matter how good your base's defences are - if they are sufficient then you can get through the first wave of attacks without too much difficulty - it's the Death Hand missiles which are the real problem. As far as I know, you can do nothing to defend against them and if one hits your construction yard then you are completely stuffed. On my last attempt the very first missile hit the bulls-eye.
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