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Yes as you say use acad.lin or Acadiso.lin ? They are text files open them up and look at the numbers they do make sense. Like 1/8"=0.125 0.375=3/8"

In addition to the previous spot on suggestions, another two system variables to be aware of, and check are MEASUREINIT and MEASUREMENT, as described in the screenshots. Whenever saving .Dwg files to use later as .DWT (templates) due diligence is suggested.

Starting with AutoCAD 2008, linetype scaling in model space is controlled by the variable MSLTSCALE and in paper space with PSLTSCALE. The MSLTSCALE system variable controls whether or not linetypes displayed in the model tab are scaled based on the annotation scale. 0 = Linetypes displayed on the Model tab are not scaled by the annotation scale. 1 = Linetypes displayed on the Model tab are scaled by the annotation scale. Note: MSLTSCALE Overrides LTSCALE and CELTSCALE in model space, but it doesn’t effect paper space, so it won’t change how geometry looks within the viewports. The PSLTSCALE system variable controls the linetype scaling of objects displayed in paper space viewports. 0 = No special linetype scaling. 1 = Viewport scaling governs linetype scaling. https://knowledge.autodesk.com/support/autocad/learn-explore/caas/sfdcarticles/sfdcarticles/Linetype-Scale-MSLTSCALE-and-PSLTSCALE.html Dots in Linetypes looked great with pen plotters in years past but a zero length line doesn't display to well with modern plotters. There are still simple ways to create them. https://www.cadtutor.net/forum/topic/69190-large-dot-linetype/?tab=comments#comment-558241

The other alternative is to use a layout, I think there are some tutorials here search. You go to a blank layout, insert your title block, make it true size ie 36x24 units then use the mview command to make a window inside the title block, dbl click to go inside, Zoom E, the plan should appear but at random scale, I work metric so will leave it for others to explain in feet how to scale.