What LibreCAD version do you use?
In 2.1.3 there are serious issues with setting up paper sizes in inches properly. You may have struggled with this. It has been fixed in 2.2.0 rc. If you are on Windows I strongly recommend to upgrade to 2.2.0 rc2.
"0.24-inch equals 1-foot" is equivalent to 1/50 scale, a metric standard. But your units are inches. Unusual.
I have prepared sample files for 11x17 format, 1/50 scale, inches and architectural dimensions. As I am German I'm not familiar with imperial stuff, but you may take it as a guide.
File versions for both v2.1.3 and 2.2.0, as they are not fully compatible. Test what works best for you.
I hope you aware of that drawings are made in original size and downscaling is done in the printing process Print Preview mode.
arch_inch_1_50_11x17_v213.dxfarch_inch_1_50_11x17_v220.dxf