We do it right because we do it twice..........

That is definitely my motto and probably should be the motto for most marine maintenance outfits.

I've been playing with the main companionway hatch for some time.  TIH came with the standard teak turtle hatch which is;
a. heavy,
b. requires maintenance,
c. is in pretty poor state.

I plan to swap it out for a Acrylic hatch (1/2" bronze translucent).  I have had real problems locating a suitable aluminum extrusion and have finally decided that they aren't available.  See this nice example from my friends Hunter 30;

Instead I'm following Rob's (Re-building a Westsail 42) example and using 80/20 extrusion.

Plan A;
T slot aluminum extrusion (#1003) and UHMW Bifold Hanger Profile was a bust due to excessive friction and I've moved on to;

Plan B
T slot aluminum extrusion (#1003) and T Slot Aluminum Linear Bearing (#6426).  So far its looking promising.