Mark,
Thank you for recommendation but my main problem is electricity which i dnt have in the field . so i m working on a small scale solar supply just to run lamps at night and pond pumps(aquaponic)... both side will have opening windows so pollinators or curious bugs can get in and out .
Gary ,
it is galvanized iron . so it dnt get rusty . about soil , i m unlucky . i guess it is purely limestone . my garden located downhill and previous owner were excavating the hill and laying the crushed material in the field .. so even you give tons of water it all goes away in a second .. i just had to buy few truck load "normal soil" as on photo .
i ll update photos . the main issue now is to take out plants from big pots with least damage . the difficulty here is the soil is very heavy and there is no way to slip them out by holding from the plant so working on it to find a better way..
on the back - nordest , i ll make a line of sapotes as many friends warned me about their height potential and the rest of green house will be mostly from cherimoyas . i ll try to add new things eventually with your recommandations .
thanks
Harun