greenhouse design.

[bil]

OK, if I can raise the money, I can build myself a greenhouse to house orchids during the lousy weather in winter.

I have a footprint of about 4 metres long and 2.5 wide, with a door in the middle of a long side.

So, bearing in mind that it will be to house orchids, what design features should I include?

Ventilation, shading... it will be housing Dendrobiums, soft and hard cane, a couple of vandas, Catts and some cymbs. Poss Phals too.

The winters can be very rainy at times, with very heavy rain, and sometimes high winds. Temp at worst down to minus 7C altho almost always if you are a late riser you would never know there had been a frost.

Frosty time just Jan and Feb.

Suggestions and advice please especially comments along the lines of "I wish I had..."