There is no earthly point ordering one of our DIY conservatories not with a view to having it all up and running for Christmas. There are several reasons for this. If you have laid a new concrete base and built a dwarf wall, the condensation would be so bad at this time of year with the floor drying out that you may as well be in a tropical rain forest!
In order for the floor and dwarf walls to dry completely, plenty of ventilation is required. At this time of year that is something that you may not want or need as the climate is cold at the moment. So give yourself an easier time and plan to have the conservatory finished in January instead.