Simple Ramp Help Needed

Even after reading several posts on making ramps, I just can't do it!

Basically, I have a situation looking a bnit like the following:

LLLLLLLLL
LLLLLLLLL
HHHHHHH
HHHHHHH

Low = a level 2 cliff, High = level 4 cliff. . . straight as can be. . . snow on all sides. and I jsut can't use the terrain Ramp feature to put a ramp between them. . . the doodad ramps in the tileset (Northrend) are tiny - far too small for what I need.

Basically, I'd like to be able to create the ramp using the 8x8 square tool over the places where my high terrain meets my low terrain. . . but it just won't let me click at all on there. I've used every cliff type and terrain type combination I can think of, but it just won't PLACE.

This is probably incredibly simple to solve, but I am a guy who's used the editor almost exclusively for triggers thus far. . . so, this whole terraining thing is new to me. . . any help?

You can't create ramps between cliffs higher than one level. To get it to work you'd need something like:

HHH
HHH
MMM
MMM
MMM
L L L
L L L


Where L is a level two cliff, M is a level three, and H is a level four.

I officially love you now =D