I got my hands on this bit of kit for £50 and it's as rough as they come. It sounds quite coarse but will save me having to cut large stock by hand. The aluminium all together cost be about £25 whilst I had all the fixings and scrap sheet of ply.
Initially I wanted to be able to cut various angle from the top but realised to do this, the chopping tilt had to be above the blade rotation. I made it the other way which means the only adjustment I can make is to at 90 degree cut. As it is now, any rotation to the left or right would mean the edge of the blade would make contact with the material to be cut instead of the teeth. I don't plan to make any compound mitre cuts, so will focus on true square cut. And in any case I could always rotate the vice.
For now I used a cross vice which I clamped down to hold a piece of mild steel box tubing when testing the cut. It seems quite accurate but I am hoping to build a vice. I will also make a larger detachable bed for the upright position, a means of clamping the saw while upright and maybe a spring to slow the drop while using it as a cut off saw.