DIY external overflow on 20" cube

[nerdz]

Thanks for the input daniella3d.

Id like to avoid the gl*******s kit because l don't want anything inside the tank. Also, ld prefer 2 drain pipes, a throttled one and an emergency.

It will be glass construction so it will bond well with glass. I'll try and sketch my idea so other know what l have in mind.

Cheers