for drainage you could go one of several ways, and it mostly depends on the size of the tank.
for smaller tanks, you could setup a siphon with aquarium air line tubing and have a valve in it. when you want to drain water, just open the valve. some people also just use a turky baster to just suck water out of the viv threw a small opening (or the pond if its part of the drainage layer).
for a larger viv, you could install a bulkhead and overflow drain and have a resevoir undernieth the viv for the water to drain into. if you have a water feature, you could also put the pump for it in the resevoir.
as for the walk out thing. a pond in the viv generally should be easily accessible so that any frogs in thier can get out easily, young or old.
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