Acrylic, bring out the hole saw!!!
since it is acrylic it is really easy to drill and modify the tank. you can easily add an overflow or two to the tank. the best thing i can think of for you to do is look at Fly guys double tank build thread. he has a great, on the back coast to coast overflow system on his 220 (i think). this is a better option than my in the tank coast to coast overflow system. this type of system allows you to do some insane flow and plumbing without the risks of critter suckage.
could you post a pic of your tank. this will allow us to see the options for drilling.
i like to keep the flow through the sump equal to the amount of water the skimmer can process. this may only be about 500gph or less. most skimmers do not move as much water as people think. getting more than 1200gph through a sump is noisey and requires large holes for drainage.
FYI- one 1" drain is only able to handle about 600gph.
G~