Hi Phil, glad to.
The trolley is very stable, despite only 3 wheels. The tyres are solid, so they are not subject to any 'give' that pneumatic tyres may have when being moved around. Where possible, I tried to build in a way where the weight of the engine would actually reduce the potential for damaging stress to the welding joins. You can see that on the end with single wheel, which is the bell housing end of the trolley. The part that attaches to the engine there, is a bracket and a rectangular box that slides into the vertical box on the trolley. There is no need for any form of bolting between the engine bracket and the trolley vertical box piece. It just sits there, one inside of the other.
I have chosen to lower the main frame, where it joins the wheels. It was done that way to lower centre of gravity, for better stability. What doesnt appear in these photos, is that I had added a reinforcement plate to the wheel brackets, at the duel wheel end. I had wanted to have additional support to overcome any problems with my less than perfect welding. So far, so good! I also have added another vertical steel tube piece to provide more strength to the cross piece that the water pumps are bolted to. Those bolts, one for each pump, are the only mechanical fastening between trolley and engine. If you look closely at my first photo of the exhaust trial fitting, you can just see one of those added tubes beneath the left water pump.
If I was to do it over again, I would retain basic shape, but make a couple of tweeks to the design. I would make the single wheel a castor wheel. Current one is fixed. It does assist in knowing exactly where it is heading when you push it, but I often have to push & pull to make a direction change easier. This is needed in my limited space. I wouldn't change the wheels I currently have. They are brilliant for travelling over concrete expansion joins, power leads,and the gravel outside the workshop. One person can move it easily. I would rethink the complex front part that the water pumps sit on. It was a lot of work, and it doesnt need to have been. I started with one way in mind, then revised the design mid stream, because I thought of a potential weakness in original design.
I would retain the single piece of tube connecting both ends. It has allowed me to have easy access from below, while retaining a fair strength. With the trike setup, uneven ground isnt a problem, and you dont get the 'one wheel off the ground' scenario over uneven terrain.
My engine trolley is just that, a trolley ONLY. It is not intended to replace a rebuilding stand. It wouldnt work in that capacity. That said, I will be installing the cam, and setting the valvetrain while engine is still on the trolley. Lower engine would be impossible to do, which is not a problem for me. I will be giving that job to a professional.
Hope this helps. These are the best photos I have, sorry!