creekbottom, i've spent some time looking for the pieces as well, the cheapest i've found including shipping to canada for the mesh is from www.themeshcompany.com
you can get 3 X A3 sized mesh in different sizes which is great for other applications as well. i am using the smallest mesh for the filter because i will be keeping shrimps, but if you are not you can use the medium sized mesh which won't plug up as easy and the larger mesh i will be using for attaching moss to rocks, etc.
as for the shrink tube search "ancor marine shrink tubing" on fleabay and you will get some options. $6 for 12" ft.
if you find cheaper places, post it up.
this is great if you have more than one filter and different sizes for each, going to save me some $$$ and give me the flexibility to make the filter for different applications.
I am glad you enjoy this, that's the main reason i posted it up so i can help other members on this forum, just like how a lot of the members have helped me
That is great! Now I just need to source the stuff.