I built one many years ago.The hardest part was drilling all the 1 5/16" holes in the beam webs for the bars. After doing a couple in the mill,I gave it to a friend of mine who had acess to an iron worker and he punched them.I used an extra 10 t portapower ram and air-over foot pump I had to power it. Still works great,my son has it now,i needed more so bought a 20t electric/hyd unit.