How to DIY Sump/Fuge?

[Twisted-1]

What is the best way to make a sump/fuge? I've heard of just using an existing tank and adding baffles but would they have to be glass or can you use acrylic? If so how do you conect them. Silicone doesn't work from what I read. This seems to be simplest and pretty much garantees no leaks. If you use glass does silicone work good/ best.

Keep in mind I am an ordinary person, looking for a realistic and basic way to build one.