For over 20 years, in the business of designing/building custom building competition models -and have built hundreds of models mostly gasoline or glow engine types - now, electric powered .models , many of em factory assembled are setting around in my shop. I started with a Time Flies , all planked class A, scale, control line kit-

We all remember the horrid rubber kits with knotty sheets of terrible grain balsa sheets which required you to cut bulkheads from them - good luck on that.
The latest ARFS from China are marvels of engineering.
The "framework is made from fine laminates of wood unusable in any other form - then machine cut by computer to utilize all but a bit of dust. the good designs mechanically interlock most of the framework and the adhesives now are very good.
earlier attempts were dreadful but currently these models are done in a fashion I could never have duplicated -unless I had the computer run production tools.
An old friend built award winning RC scale stuff which was heart stopping to fly (heavy as sin) !
If you want a task- try building an aerobatic model which weighs under two ounces -
without present materials - forget it.
But we still enjoy assembling small balsa models -----------