Not to mention that when you get to <0.100" material, the skill level required to weld aluminum goes way up. Nothing like burning a hole is the last weld, killing the entire piece to ruin your day.
If you have the resources, welding is great fun. If I had the resources in place (A good welder for aluminum is $1000+) it is a good resource. If you don't there areas that would get more bang for your buck. YMMV