A machine like the plow. Would need these items for a slow one like a regular plow:
10 blocks of wood
10 sticks
4 boards
10 stones
For a metal one:
3 bars of any strong metal
10 blocks of wood
10 sticks
4 boards
Plows can be used to quickly plow the land and not waste as much stamina as you do by hand. Metal Plows get the job done faster so why do we have to lay stone by hand?
My idea: You make the machine and you have to insert the stones inside before hand and then you can go on your way. This could be used to save time, stamina (not a whole lot but still some), and a faster job. The regular stone machine would sometimes not pave every tile correctly so you have to pave some spots by hand or it will decay. As well as plows do the stone machines will decay over time and the regular stone machine will need blocks of wood to repair and the metal stone machine would need metal.
P.S: If this has been suggested before I did not find it so please post the link. Regardless I went into more detail most likely.