I need to cut two pieces of AA6-063x3/4x3/4 angle for my 728B and 729B angles. these are about 2 feet and about 3 feet respectively. The only pieces of AA6-063x3/4x3/4 that i have that are long enough are two 12 foot sections that came in my wing kit. Is it OK to cut these up, or will i need the full 12-foot lengths later for something else?