Piss easy design… similar in idea to most carbon filter design and crafts…however use kitty litter instead of activated carbon…
I prefer silica kitty litter, and not a round chamber style build but like levels of book shelves and fly screens on each level an extractor fan on top or top rear with in take holes at the bottom…try to air seal everywhere else so air is forced through silica kitty litter not by passing it…
Easy peasy…
Without trying i will guarantee you this will only work for a day or two. Even the peltier dehumidifiers are mostly too small for grows. Get one with compressor 
This is meant for small time growing like 2ft by 2ft scrog up to 6ft by 3ft set ups…also i really only use it for drying times … where I used this design it was basically a desert and rained maximum of 8 days a year…
With enough levels and enough kitty litter which is here about $20 2 kilos it’s a cheap easy alternative for small time setups or a week or so of drying times…
For drying purposes should be alright, if you try to dry slowly at 60% this should be possible without the construction, or let the air exhaust though a window.
I would think adding rock salt to the silica, would increase the amount of humidity that can be held in the silica.
2 buckets, and rock salt will dehumidify a small area really well.
DampRid works pretty well for small spaces 
PS this might be a dangerous thing to say by me however i dont care…It might give my old location town away but i used this dehumidifier design after a cyclone destroyed my old town…Rained for weeks on end where it usually rains max 8 days a year…This silica kitty litter obsorbed water and humidity like a dream…I did pour some kitty litter under windows which were broken and that worked absorbing any water run ins and the home made dehumidifier removed humidity like a dream…
More useful doing that after storm damage than actual growing uses really…so it might actually work for longer term needs, as it did after a cyclone ruined my house.