No problem ....
Sump can be as simple or as ellaborate as you want to make it.
I've got a basic 30 gallon rubbermaid plastic container under my 75. Pretty basic.
You'll need a minimum of;
A hang on the back dual overflow boxes, u-tube syphon, prefilter sponge, overflow hose, sump container, return pump, return pump hose, spraybar and appropriate hose clamps ... those are necessary basic components you'll need for it work.
Heater and skimmer contained in the sump. Much of the wet work like kalk drip, water changes, additives all preformed in the sump.
When you're laying out your plan/design, keep in mind you'll need to access these components from time to time for cleaning and maintenance. Try to have a large enough sump so you're not trying to cram everything in there.
Many people DIY on the overflow and spray bars. I'm sure they can help you on that end of it.
If you are hesitant about DIY - I'd suggest you purchase those items.
Go to <a href="http://www.google.com" target="_blank">www.google.com</a>
Type in the phase
How to build a sump for a reef tank
Tons of info on the net - free
Have fun and go to it !
Broomer