Seems to me that this car is probably legal, or gray at best. The stock tower structure is odd, and the solution seems in line...but it is definately something I can see reasonable men disagreeing on.
The rule needs to be written in such a way as to be efffective across a large range of physical realities...and allow enough freedom so that any group of cars that have a certain "Type" of structure are not excluded for a solution.
On the other hand..........leaving the rule open leads to simple stretching of the allowance by people who don't understand the goal and intent going in, or who flat out want to take advantage.
Alls fair in love and war, right??
Well, the system is larger than the rulebook, and to truely define what can and can not happen per car, it needs to be tested. That means a protest, and an appeal, or a paid for rules inquiry.
But we as competitors stop short, and decide to render judgements of our own. It's human nature...but we shouldn't complain until the system has had a chance to work.