Metal mesh reinforced gasket is very hard to cut.
I have made a couple 3 hp gasket out of a steel mesh reinforced gasket material.
If you have a scanner /printer, place the cylinder head cover on the scanner bed, pack with fabric to exclude light and print it out.
Print out a couple of copys and glue them to a couple pieces of plywood. Cut cylinder holes with a hole saw , or jigsaw. drill bolt hole, cooling holes with appropriate size drill bits.
Sandwich the gasket material by drilling out the bolt holes first. Start at a corner first, then diagonal corner next.
Bolt the sandwich together, and then cut out the cylinder holes . I used a Forstner bit in reverse on the metal reinforced material.