DIY multi-purpose exercise bench for only $30 - YouTube
DIY Weight Bench: Welded up from an old treadmill frame. 3/4 plywood, 1” NBRfoam/dacron, and vinyl make up the bench top. Painted with a hammered black spray paint : r/homegym
Designing a Homemade Workout Bench with SOLIDWORKS Weldments
DIY Workout Bench with Storage - Jaime Costiglio
DIY workout bench - some pics from the making process : r/homegym