way to go. not too shabby at all. good thinking. how long can sectioned trekking poles extend (150cm, or more???). on an angle, still might get some reasonable headroom, not great, but still workable. what wall angle were you thinking of?
also, would also work for a single-wall pyramid, like the BD MegaLight, with 4 sides and much smaller? w/o using stakes, how do you keep the other sides down. to stabilize the poles, those internal guys need to be in tension - what's holding them to the ground?
a small "hub" like used for the BA Seedhouse1 SL (and i think also on the MSR Hubba) with 2-4 sections on side, or just a short curved sectioned, shock-corded pole could, for very little weight maybe be used to increase peak height? the pole would basically function as an extender for the hiking poles. maybe their tips could fit right into the ends of this "extender"?
for most people an extender would be a must for fixed length CF trekking poles.