Eagleview
Veteran Member
Strength is not in weight , but in fabrication . There is nothing wrong with using pipe for the portal frame as long as you incorperate common sense . If you add a horizontal pipe too your trusses and maybe an upright or two , your truss will be very strong and not be able to spread or sag . As for the uprights i would upsize or using the pipe you have fabricate a webbed column using the zig zag design using small tube or round bar for the web . Before fitting the cladding add X braces/straps between the columns where there are no doors to finish off the design . The cladding will do the rest .