Mine goes up the wall on the stairs to the basement. Never more than a foot off the ground, but small, hard holds make it stupid hard, so its a challenge rather than 30 secs of climbing. I've managed it twice. Mine is bolted direct into brick rather than ply and t-nuts. Not as variable, but more aesthetically pleasing. I bought a set of 18 small holds, which once they get easy I can turn to make it hard again! For fitting straight to bricks/blocks you'll need expanding bolts (12mm drill bit, drill in about an inch, then hit with a punch to expand) 10mm bolts hold the holds on and can then be rotated/swapped as requires,though the position of the holds are fixed! ThT said, my wall is fairly straight forward, for leg arm leg arm etc. With a few randoms chucked in for mad hangs! Can't remever which site I used, but all in it cost me £40 and looks good as well as being challenging climb! I'll try and sort a photo later!