Plant Growth Chamber for Seed germination and Algal Growth

This chamber is frequently used by me for seed germination, seedling development, growth of algae in flasks, plant production, plant pathology research and growth of legumes/Arabidopsis. It's good for growing several pots simultaneously as it is spacious. However, sometimes when you need more space it is not enough, but in the lab it takes up too much space, so fitting more than one chamber is sometimes hard. If there were space for a flexible rack, that would be great, particularly for when you need this chamber for seed germination.