swords - imho i would stick with materials that do not degrade. primeagra (pa), epiweb, perlite, sand, diatomiceous earth (de). pa, perlite, sand and de would help with terrestrials, while epiweb could be used with mounts, walls, vines, etc. using these materials will help with a number of things, in no order - maintainence, decomposition, repotting, disease control, general repairs, adding more epiweb mounts/walls to accomondate growth. it would allow you to more easily regulate ph, tds, ppm, ec/cf, etc. in a pool area that you will need for the frogs. you should now start considering some other accessories like lights, ventilation, misting systems, electrical timers.
what are you making this out of? acrylic, glass, adobe?
you will need to consider glues/solvents needed for bonding different substances. you'll need air pump, airstones, foggers, tubing for all those goodies. if you have money, then consider supplementing co2.
i have built some vivariums/terrariums but never specifically for orchids. the orchid hobby is relatively new to me but i am already designing my own orchid only vivarium using these principals.
just my two cents.
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