finally got round to starting

[steve birks]

Hi all finally got round to starting my build after a long !! time .It took me over 12 months to build my shed /workshop so i could start my build .
just a quick couple of questions for anyone really
1 what are the dimensions of the holes to be drilled in CP 10 .it doesn't show them in the book
2 is it a mistake or are diagonals d1 d2 d3 and d4 19mm box section