Finall got the hatch done for the tank, its 4"x 5" in size and the hatch cover is 1/8" balsa with a 1/64" plywood skin,

my previous Waco didn't have anything in the way of an access, and wouldn't you know I'd have a tank issue, ready to final sand, and onto covering,

I guess its safe to say I can see light at the end of the tunnel.