One of the challenges with inverted V tail is calculating total length and width of the panel that is then bent at the required angle to get the V tail. This spread sheet calculator helps with calculating panel length and panel width for a given main wing area/horizontal spacing between the booms/tail height/tail angle.
You need to specify any two of horizontal spacing between the booms/tail height/tail angle and it will also calculate the third parameter.
I hope this will simplify designing V tail for your scratch build projects!
https://docs.google.com/spreadsheets...VbcZ7iz2sNh6PA