I will try my best to describe the board I have that I purchased from the RNIb to my knowledge this game is not in production for now. This board is about 15 years old I think.
You have four colours:
Bottom left Blue
Top left Red
Top right Green
bottom right yellow
and they follow in a loop.
there is a big square for each colour and in that colour is 4 tokens and they make up a smaller square.
In between those squares is 3 lines of holes and each hole represents a square. The shape is a big cross where all tokens meet at the end of the game. the Object of the game as you know is to get all 4 of your tokens home first. The outer lines of holes are where the tokens race round the board. The middle line is for home squares, each colour has 6 home squares each. All home squares are the same colour as its token, blue squares are for blue and are blue etc. If a token is on those home squares they cannot be taken.
Now I will take you round the board starting at the blue start square. I will try to do it like Duck racing boards: (All squares are white unless stated.
Please note forward means you are going up the board. My explanation is from the Blue player point of view so it would be different from Red, Green, Yellow.
You do need a 6 to start.
Square 1 Blue start Square (Blue) - (you are near the bottom of the board so move forward)
Square 2 Move forward
Square 3 Move forward
Square 4 Move forward
Square 5 Move forward, starts to turn left
Square 6 Move forward, starts to turn left further
Square 7 Move Left
Square 8 Move Left
square 9 Move Left
square 10 Move Left
square 11 Move Forward (You are furthest left of the board)
Square 12 Move forward if Blue, Green or Yellow - (Red moves right where the Red Home squares 1 to 6 are). (the home squares are coloured red).
Square 13 Move right
Square 14 Move right, Red start Square (Red)
Square 15 Move right
square 16 Move right
Square 17 Move right
square 18 Move right, starts to turn forward
Square 19 Forward, starts to turn forward further
Square 20 Move forward
Square 21 Move forward
square 22 Move forward
Square 23 Move forward
Square 24 Move right, you are at the top of the board.
Square 25 Move right if Blue, Red or Yellow - (Green moves down to where the Green Home squares 1 to 6 are). (the home squares are coloured Green).
Square 26 Move down, furthest right on top of the board
Square 27 Move down, Green start Square (Green)
Square 28 Move down
Square 29 Move down
Square 30 Move down
Square 31 Move down, starts to turn Right
Square 32 Move right, starts to turn right further
Square 33 Move right
Square 34 Move Right
Square 35 Move right
Square 36 Move right
Square 37 move down, (You are furthest right of the board)
Square 38 Move down if Blue, Red or Green - (Yellow moves left to where the yellow Home squares 1 to 6 are). (the home squares are coloured Yellow).
Square 39 Move left
Square 40 Move left, Yellow start Square (Yellow)
Square 41 Move left
Square 42 Move left
Square 43 Move left
Square 44 Move left, starts to go down
Square 45 Move down, starts to go down further.
Square 46 Move down
Square 47 Move down
Square 48 Move down
Square 49 Move down
Square 50 Move left, you are at the bottom of the board
Square 51 Move left if Red, Green or Yellow - (Blue moves Forward to where the Blue Home squares 1 to 6 are). (the home squares are coloured Blue).
Square 52 Move forward to Square 1 Blue start Square (Blue)
Hope this is helpful enough, I did see some of the options you suggested but will have to take a proper look another time. This is not perfect in terms of typing consistency but the squares are correct.