climb wall controller

hy all, i would like to wall climb my character controller;

i got an imported terrain file (.mb "maya files").

This terrain have a vertical wall and i have add plane mesh (witch is in trigger mode) in the front of it to detect when the character controller collision with it.

Then i used cubes with no mesh render and trigger off "to draw way over the wall".

When controller OnTriggerStay i use myVectorDirector = wall.transform.TransformDirection(myVectorDirector).

I do the same OnTrigger functions on other cube to ground again my controller on the over-top on the wall.

it works good.

but i got some trouble when i want to make it hang by his hand on top.

I would like to know if there are an other way to do this ?

Sorry for my english.