A good concept, but ditch the weed whacker and get a brush clearing saw (basically, a weed whacker on steroids with "bicycle handles"). Also get a blade designed for cutting saplings for use with these saws. An ordinary circular saw blade is not rated for the RPMs these saws turn and have been known to come apart when cracks or other flaws develop. Those cracks and flaws are more likely to happen in a circular saw blade: it's stiffer and more brittle than a brush blade, and prone to developing cracks as a result of impacts. You really dont want to be around one when it start to come apart and fling shrapnel while turning at several times their rated RPM