The engine is 7,5'' long, measured including the front mounting plate and starter but without a collet.
It is 5'' wide due to the fact that both red couls are mounted on the sides of teh flywheel.
The engine rails in my Skater cat are 6,5'' wide so I can use the engien mounts what come with the engine kit (5'' engine and rubbers).
Distance between spark plugs is 65mm or a little bit more than 2,5''.
There are no drawings or so.
Normally MTC offers the engine as a kit. So you get the case with crank, crank coupler (all mounted), front and rear plate and reworked flywheel. To complete the engine you need ignitions, pistons cylinders and all the small stuff for assembling.
It will fit between 5'' rails when build your own motor mounts. And you have to rework just a little bit the ignition plate.