Aluminium Dock Clamp Blocks

I’ve mocked up a simple pair of aluminium blocks and now need them turned into proper, machinist-ready CAD. Each block will finish at about 80 mm high × 60 mm wide × 100 mm deep. Rear face: the two halves close around a tube in a clamshell style... (Budget: £10 - £20 GBP, Jobs: 3D CAD, 3D Design, 3D Modelling, AutoCAD, CAD Drafting Review, CAD/CAM, Fusion 360, Solidworks)