Gday Guss, i wouldn’t bother with the 3.5” for a long net mate… okay for ground nets but not ideal for long nets. If you want to build one yourself, hit up CH SMITH marine in Melbourne and see if he can get you any 108mm 210/18ply. The 3.5” is gonna result in a lot of bounce offs cobber.. the 4.25” (108mm) is bloody tricky to find in Aus but CH SMITH can definitely order it in! Tie it back to 200% (so 50m tied back to 25m etc.) Fibreglass temporary fence posts through Murray Goulburn…Get your grommets from Bunnings (pinnacle brand, 10mm) and use 2mm Venetian cord for head and footer line (also