For this one it's a .050 per inch butt wedge.
White is a parallel 3/4" thick or thicker 19" long.
Mark a line at 6", 12", and 18" on the white board.
.050 x 18" =.900 thick, the white block on the left, run a board threw the thickness sander to .900 thick, cut a small piece off.
.050 x 12" = .600 thick " in the middle. run the same board threw the thickness sander down to .600 cut a small piece off
.050 x 6" = .240 thick " on the right. repeat
Hold each piece on the line and use super glue on one edge. repeat.
Red is going to be the sled, cut at the dash line and super glue it like before, run it threw the thickness sander until it is parallel, pop off the red board and you have a sled .
I have made many sleds this way.![](https://i.imgur.com/YapSCmg.png)