Hi Dale; I should add that I did not do the plans that are available. There are several minor things that were omitted or left to the end user. Things like the set screws for the dowel pins in the toggle arms.
The cross brace for the link arms really needs to be as high up to the base as you can get it. There isnt much use if you put it on one end of the span.
Most of the other lengths on the ram and linkage can all be juggled around to some degree depending on the dies and what application the guys building it has in mind.
There are a lot of variables depending on the dies a person uses so its tough to commit to one specific dimension.