[C320-list] Grid liner & bilge design question - newer vs. older issues

[Sean Kaldor]

I'm choosing between two 320s... a 1994 vintage and a 1997 vintage.
 
One of the design differences between the two is the grid liner and bilge set-up. As  I understand from this site, a deeper bilge with better weep holes to drain the pan was added around hull #246 (late 1995). And all hulls up to #355 have a technical reference bulletin about the need to drill access and drain holes throughout the grid liner for regular draining to the bilge, inspection, etc.
 
So my questions are ... are these changes/improvements important, or are they just footnotes in the design history? If you have an earlier design, is the grid water draining an issue - did you drill the holes, does water collect? If you could choose between a pre-246 hull and a post 355 hull, would this even be a consideration? Is there any long-term effect on the structural grid members? 
 
I'm curious about your experiences and opinions.
 
Thanks!
 
Sean
Hull #TBD