My approach: Making a custom case for Epi LTD Explorer
Not to rain on Your parade, but with a few decades of experience about everything DIY, unless you two are pro casemakers, or take shortcuts on the materials or the construction methods or steal the materials, the money saved will be neglible.
Of course, if an over the counter case is not available, there may be slight chance of saving some money.
Unless You calculate more than a ~$5/h for your time
It's fun as hell though.