You should take a look at some Native American languages - Navajo, at least, forms neologisms by nominalizing verb phrases, as you seem to be doing. There was someone at an LLC who had a fantasy-world Native American inspired conlang that was incorporation-happy - anybody remember who? In your conlang, can you separate the noun from its adjective? I-house-built big for 'I built the big house'. Come to think of it, how do you handle adjectives?