I'm not sure what you mean here. How would I attach cross peices to the hoses?

They make 1/4" micro poly tubing too, that could be used for the horizontal pieces like branches.

www.hoosierpondpros.com

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).