Help with aluminum channel

[Flyinpine]

I could sure use some help!! My Fisher Horizon plans (like all of Fishers designs) call for the use of 6061 T6 aluminum channel in 1" and 1 1/4" widths for spar carry throughs and to make brackets to attach various tubes. I CANNOT find this stuff ANYWHERE, and have had no response to calls to FFP.
6063 T5 is JUNK and has less than half the strength and is much more brittle....and the corners are not radiused.


Can any of you help me out? I am really stuck.

 

[dcstrng]

 

[Vipor_GG]

 

[user 4289]

 

[Matt G.]

 

[cvairwerks]

 

[BobDaly]

 

[Matt G.]

 

[BobDaly]

 

[Matt G.]

 

[BobDaly]

 

[Matt G.]

 

[BobDaly]

 

[Matt G.]

 

[lake_harley]