Hi, I will try to describe the canopy release sytem first.
3 pulleys -one is mounted at the base of the pilon,one at the top of the pilon and one on the front of the firewall bolted to the motor mount,all can be seen in the photos.
1 piece of carbon fiber rod approx 8 " long 1/8 th to 1/4 diameter will work-this rod will have a hole drilled in one end for the pull line to be tied to,the other end is rounded as seen in the pics.This rounded end will be the piece that sticks in to the rear of the canopy to hold it down.On that long rod you will place a locking collar (like used to hold wheels on landing gear),a spring and silicone tubing.
The rod needs to be long enough to go from a couple inches away from the pulley at the base of the pilon and go all the way through the little former where it will stick an inch or so in to the canopy.If you look at the pics you will see how the rod has a spring ,then locking collar ,followed by surgical tubing(you could use another spring or 2 pieces of tubing).Looking at the pic that shows the spring you can see where it goes through the former,I added a little block of wood for support.You put the spring collar and tube together,insert them into the rear hole (compressing the spring) and then lift the front end up and stick it through the hole where it will go into the canopy to hold it down.It takes a little trial fitting,once in place tie your line through the hole drilled in the end of the cf rod,the line then goes into the pulley at the base ,upward to the top pulley,forward through the firewall and finally goes around the pulley on the motor mount(with the cable guard).This has the pull ring on the end.Pull the ring ,it pulls the string which pulls the carbon rod rearward compressing the spring,releasing the canopy.Let go and the spring pushes the rod forward by pushing against the locking collar.Place the short pice of cf rod in the nose of the canopy as a hold down dowel ,see pics.
For sealing the hatch
lace foam strip as seen in pics
cover the hatch opening in saran wrap and tape it down ,
next test fit the canopy using the latch mechanism you made to hold it down.
Take the canopy off,lay a generous bead of silicone around the inside edge of the canopy and place it back on the fuselage for 24 hours.Wipe off excess silicone,I outline the gap with painters tape on both sides and after wiping off excess I pull the tape right away before it dries leaving silicone only in the gap where you want it,the rest dries for 24 hours .After waiting release the canopy,pull it off,take off the saran wrap and you have a custom silicone seal.do the same on the pilon hatch.I hope this helps if you need more information let me know.