Suggestions on Alloy and Size

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I am building an aluminum chipper box to fit into an aluminum flat bed for my tree care business.I had originally planned on using 6061 .190, 1.5"x3" rectangle for my five foot high vertical uprights.It seems overkill as I plan on adhering 3/16" ali sheet to the frame.  My current aluminum box is 6061  .125 1.5"x1.5" material and it stood up to the test of time.Problem is, the supplier cannot get .125 6061 1.5"x3" for me.  They can only get 6063.Do you guys feel like the difference will be noticable in this application?  Does 6061 and 6063 coincide with each other in terms of welding?  What filler rod would you recommend for 6061, and 6063?  Both separate and combined?What I am building is something like below.  The box will slide into stake pockets along the edge of my flat bed.  It's a very simple frame, connected at the top and at the front.  The rear is open.  The sides will be adhered with a 3M adhesive, to reduce distortion and have the option of future replacement. Attached Images
Reply:I was just doing some research.I can get 6061 Alum, Association channel.  That will be 1.5x3" x.130.Thoughts, suggestions, greatly appreciated.
Reply:6063 is the standard for extruded shapes and will work just fine. 6061 and 6063 weld together just fine. I'd use 4043 filler, and 3M VHB tape to bond the panels on.Welding/Fab Pics: www.UtahWeld.com
Reply:Thanks.  You read my mind on the tape.  I had some samples of that and did some strength tests.  That stuff is amazing.
Reply:There's lots of different flavors oh VHB tape so make sure you're using a tape that matches the surface energy of the materials being bonded.Welding/Fab Pics: www.UtahWeld.com