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[Lene]

i fully agree with leigh,
this is an expensive hobby, if you cant accept the money side then you shouldnt be doing it.
i dont think free enclosures are a good way of encouraging new handlers at all, its encouraging to do things on the cheap, and your aiming at people who dont know any better, or choose to be ignorant to costs involved
if you can afford to build enclosures for near nothing, dont try to play good samaratin and give them away to inexperienced people who cant afford to do things properly. most likely your doing more harm than good.
donate your skills, or build to order, certainly if you have an interest in building enclosures your allowed to pursue it. i only hope you are an experienced keeper yourself who fully understands all the needs of a good enclosure. because even many of the expensive pet shop ones get it wrong. and if you get it wrong too, you have encouraged and offered poor housing.

its a big responsibility your asking for in my opinion.