you guys are overthinking the whole block breaker thing on the solar spammer. A much easier thing to do is to just use a template table to make a template of AIR that is the same size (horizontally and vertically with a 1-block depth) as the machine and then have pipes cycle the template into a builder that sits at the front of the machine. Apply redstone to a fueled steam-engine and wait the maximum time it would take to clear out the entire space in front and then your good to go. Additionally you should experiment with what fuel sources you can make out of uu-matter for the steam engine and see which one gives you the most total burn time for the amount of uu-matter used (hint hint)
Also unless im missing something it is impossible to make a foolproof blockbreaker array that can clear the path of the solar spammer due to the need to have redstone and frames all connected to it at the same time