I took a closer look and see the swing of the cradle now. It would require a little more engineering for log support, but the sliding log concept could work.
Well, for a real wood furnace, you have at least 2 feet you cut off hanging off to the right. The table holds about 4 feet, and you let 2-4 feet hang off the left side. That balances just fine. More than 10 feet, you are getting pretty long or heavy to handle all day long? Might sound good in print to buck 20 foot long logs all day, until you've tried it.
Best to have 3 people, possibly 4, for cutting a mess of wood. One bringing logs, one running the table, and one handling the cut pieces. If you need to walk a ways ot stack in a truck, might need a 2nd person on this side. The person bringing the logs can hold the far end of the log for the first cut, thus supporting the far end - no need for a bigger table.
It doesn't really work to let the cut pieces drop on the ground if you are doing a lot of cutting. The ground fills up with firewood pretty quick, and piles up to interfere with the table action or the blade itself.
The real debate is the solid table top or one made with openings. This solid one the logs will slide by much easier; but he will find a lot of bark & small branches get into the saw opening - real pain in the rear. But if you have more of an open table, the small bits will drop away and not get to the saw blade - but every knot on the logs will catch on every rib of the table, making it hard to slide the logs to the right. The ying & the yang.
All depends how serious you are on wood making. Dad used to spend winters in the woodlot making firewood for 3 houses (ours, unkles, and grandmas) that were heated 100% with wood in this Minnesota climate. He didn't need a gym membership.
That is a nice rig, if I came across one I'd be real interested. As I'm mostly by mydself now, I haven't mounted our old unguarded belt driven saw in years, just use the chainsaw.
--->Paul