You can still build them that way... but they have to stay like our original camps/cottages.
We still sell compost toilets for those that wish to forgo the cost of a septic system, kerosene lamps and hand pumped wellheads for those that want to forgo electricity, small wood stoves with all the accessories for fall/winter meal prep, and small grills with green one pound propane cylinders for summer meal prep.
Without water and electricity, you basically have a garage/shed that you can legally stay in for roughly six months steady or intermittently throughout the year.
You can even use the original clapboard (we now call it double clap so that newbies don't get it confused with bevel siding) or novelty siding (originally called dutch lap). We even have shiplap log siding and brushed (rough) shiplap to make a log look or board & batten. 1x12 form board will also work for B&B, but needs to be air dried long enough not to split and hold a stain.
But all that siding is more expensive than a smartpanel for coverage.
We still have red pine flooring (prior to WWII) and SYP (after WWII)... but it can be more expensive than just inexpensive LVP or a stain-seal application over 3/4 ADV.
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