ALL THE OTHER INPUT, VERY APPRECIATED.
BECAUSE I AM LAZY TONIGHT AND HAVE NEVER USED THE FREE CAD PROGRAM, COULDN'T I JUST USE THE NUMBERS PROVIDED IN the DIAGRAM:
100MM EXTENSION IS RAISING THE REAR ROUGHLY 75MM. MEANING THE 50MM EXTENSION WOULD RAISE IT HALF OF 75MM = 37.5MM? That would be close enough.
SOLO, WHAT YOU SAID MAKES PLAIN SENSE. I will give that a go tomorrow if I can do it on my own. Finally with have some time to plunk down a whole day on it.