How do I build a 4x2 Piston Gate?

I have been searching the Internet searching for the solution, but I have yet to see it...

Just to clarify I am NOT looking for...

I want to solution to the following gate...

The Gate is very limited to the space above the opening as I can not place any redstone wiring above the Gate's Opening. I'd prefer the solution opens the gate Side to Side. I already know how to open it Up & Down. I was thinking the solution would include the use of Sand and or Gravel. as you could force it upward and let it fall when the pistons are contracted.

Solution 1:

Take a vertical 4x4 design and rotate it 90 degrees?

Solution 2:

So what I had to end up doing is make the gate out of gravel (any type of falling block would work) and have 2 pistons (the bottom being a sticky Piston) push up the gravel and contract as so...

Contracted (Unpowered)

Extented (Powered)

I just found this was the easiest way for the gate to work.