[Dragsinger]

Your work must be accurate. In addition, you will try something and it will not fit as expected. Do not be discouraged. Walk away, take a break, give yourself time to think about the options.

The first pic shows the front wheel base measure point. It is simply a screw into the plywood top that allows hooking a tape over.

The next two pics show the rear axle center ref on table and square bring center line up to housing