Thanks for your question!
We made our giant scrabble board out of 8 pieces of construction paper which we laminated and then taped together (only so much could fit through our laminator at one time). The double word scores, etc., were made with colored paper, and the grid lines were made with thin black duct tape. We printed the letters on paper with a fake wood grain background (made in MS Publisher) and just glued them to cardboard (we cut up some old boxes into squares) to give them the look of wooden tiles.
Our board itself is a little over 10 x 10 feet (closer to 11 x 11), and our letters are roughly 8x7 inches. We looked at the proportions of a regular scrabble board, and then fudged it a little to fit our needs. If you want to make this it’ll all depend on what size paper you have, what size grid lines you will be using (this is more of a factor than you think!), and what will fit through your laminator.
The most difficult part is drawing out the straight lines, and making stands. Our stands are also made out of cardboard (covered with black duct tape). They are basically a triangle wedge with a lip at the bottom (another, smaller triangle). We used some cardboard bracing underneath and a lot of tape to hold it all together.
For the game itself, we usually set it up in the middle of library. There are 4 “teams”, and people can come and join a team for as long as they want. They could stay for just one word, or they could stay for the entire game. It’s very free flowing. We keep the letters in a cardboard box for people to draw out of, and we keep score on a dry erase board.
Thanks for your comment!