4" and 35's will clear, it's just not optimum. Standard tube fenders will barely gain you anything, especially for the $$$$, but highlines give you boat loads of clearance (too much for 4" and 35s). Metalcloaks are a good design but I think they are kinda ugly, and for the price of Metalcloaks you can do a real highline and gain so much more.
You have something against a BL? They are pretty useful when it comes to building.