I've just come across this... will this work? http://www.amazon.co.uk/dp/B00P9D4DRO?psc=1#productDetails
I've used my trusty "tiger" saw with a metal cutting blade to cut through 3.5 inch diameter 6061 aluminum. You have to secure the piece in a vice so it does NOT move. Still it's not a piece of cake to cut but with a little wd40 on the cut occasionally it will cut through it. You would have to bundle your pieces tightly then secure the bundle in a vice or standing on it raised above ground so you could cut each section off. (Kind of like a carpenter cutting off the end of a 2x4 using a step stool). The key to this is keeping the saw up tight against the bundle so the blade reciprocates and not you!!!! . The reciprocating saw is probably the most versatile tool you can own if you are a homeowner. There's always something that needs cutting and this is the tool for it.