I was initially going to go with a ghost overflow before my build and then decided on having external overfows built on my acrylic tank from the builder. Rigid pipe is not a problem. In the first day or two you will notice noise but that is just becuase there are pockets of air in the line. Once that is pushed out it will be completly silent. Only thing you will hear will be your pumps. Listen to
JK47
J
jaws7777
they both helped me a ton. I followed Jaws build on mine and did a few things differently. Take a look through both of out builds and you will see. Also unions for everything! They make everything so much easier. Also Flex PVC pipe is pretty sweet and makes things a little easier if you dont want to worry about cutting pvc