One thing I've learned, both as an engineer and as a modeler, is that I know of no equations that adequately describe (predict) the disproportional detrimental effects of drag on our models as a function of size. Yes, the Reynolds number is to address most of this. But it is my experience that empirical observation show that drag is more pronounced than what the equations would indicate.
This is why I place so much emphasis on drag reduction, both induced (weight) and parasitic (wetted area). I can't think of a place where adding small protrusions could have a more detrimental effect on drag than in junctions. This is why I think it is so important to remove the rubber bands and dowels in those areas of the aircraft. While I'm all but positive that the original designer of the Sinbad wasn't aware of junction drag. You will see on the original plan that the hold down dowels are placed well down on the fuselage away from the wing and fuselage junction.
In this age of the laser cut kit I see no reason for sheeted tail planes. Sheeted tail planes bring back bad memories of models like those of Tern Aero. I built 1/2 a dozen of the
Tern Aero Traveler Sailplane only to find that I couldn't hold trim as the tail warped minute by minute and between flights.
Now a firm that I think is the epitome of balsa micro design and manufacture is
Stevens Aeromodel. Here I'm showing his keyed style of build. On this stabilizer you can see the grain direction of the parts are all going the correct direction for their intended function. Also notice the tight fitting keys at each joint. These keys make it almost impossible to misalign the parts and add much needed glue area. These open (stick) structures are often 1/3 maybe 1/4 the weight of the same area sheet surface. They are 2 to 3 time stronger with so much of the grain going the correct direction. And in my opinion infinitely more resistant to warping!
With the laser cut parts this kind of high parts build is actually fun! FYI; this tight fitting multi piece "large" contact area construction does lend it self to the use of thin CA glues.
In my micro Sinbad build I'll be using the traditional cut to size stringer with gusset supports for the tail surfaces. In Nick's video I was surprised that he used a 500 mAh cell. This just validated my opinion/concern that the tail is too heavy.
I think there was only 3 or 4 planes out flying, one of them being our RnR Nova (unobtanium$$$) 
Just make a ballast box !!!
