I bought this stand about 5 years ago - it was professionally made out of 40x3mm square box section, there is some surface corrosion but it is very solid.
I used it for a 40hp and an 8hp but it was designed to handle much higher weights.
1300mm high; 1100mm long; 680mm wide with 125mm castors on m12 studs (two braked).
As I have sold the 40 it is now surplus to requirements - collection from Warwick or I could deliver for free between Warwick and Bournemouth.
In the way of things I paid far too much for it... does £50ono seem reasonable?