Here at ECHO North America we have been using Poly-propagators extensively for micro-climate control especially for rooting cuttings.
We have several poly-propagators on wheels that we can manage for the particular needs of our cuttings. Rolling them under tables for extra shade, leaving more open for drier species, keeping saturated for plants that love water or adjusting all of these depending on the stage of growth our cuttings are in.
In the winter months we expanded to build poly-propagators without a mesh bottom or wheels that can sit flush on top of our heat mats on the green house tables. You can find the details of that build here Poly-Propagators Build Step-by-Step Instructions.
In general we have love the flexibility these have given our nursery. Allowing us to tailor the environment to plant species and climate conditions. This has been much more functional for us than a mist house and operates on such a small scale with high possibility of adaption for construction materials and environments.
For more in depth information, check out this EDN about Poly-propagators.
What is your experience with growing environments like this? Have you adapted this to fit different climate or material constraints?