Here is a weight saver I used and mine is just fantastic with a ZDZ40
replace spruce spars with balsa. laminate carbon fiber on top of top spar and bottom of bottom spar. I used thin ca. these spars are covered again with the leading edge sheeting.

replace the 3/8 ply carry through spar. construct new one from 3/8 balsa sticks. ca carbon fiber on top of each stick and laminate sticks together with epoxy. put in clamp until dry. Take plywood spar to use as pattern and cut out your new one. Over a 1/4 # savings right there.

I also replaced all light ply in wing with balsa. (optional) small weight savings but it all adds up.

Real pricy for the weight saved BUT you can replace aluminum gear with composite gear. my composite weighed 9oz. vs aluminum ?

My mw300 finished at 14#3oz. since then I have added some doodads and it weighs 141/2 l

I guess I'm the only one that likes the mw tailwheel. light,simple ,strong and works great