Inspectability
I don't know what your own laws are pertaining to bees, but over here a Bee Inspector has the right to insist on inspecting brood combs individually and, if there's been an outbreak of Foul Brood within the vicinity, then to take comb samples as well.
We have no bee inspectors (anymore). There are laws with regard to AFB (and now also small hive beetle) outbreaks, but no ease-of-inspection regulations. Obviously if your region has these extra rules, you should stick to framed or top-barred hives.
Personally I find the requirement to be able to inspect combs individually unnecessary -- no bee inspector is going to inspect all 1000 brood frames in a 50 hive apiary. No, he'll check the middle frame of each hive (if indeed he does inspect every single hive).
In the skep beekeeping days, bee inspectors inspected the brood nest by cutting away a strip of comb from the middle of the centre comb, using a knife on a stick.
I'd like to think of myself as a responsible beekeeper w.r.t. brood inspection, but having the ability to take samples from the middle of the brood nest would be sufficient for my liking. The easiest way to accomplish that in a fixed-comb hive is to have openings in the hives walls (or, in the case of horizontal fixed-comb hives, a removable floor). These openings can be doors large enough to stick a gloved hand into or plugged round holes into which a long apple corer type of device can be inserted into.
On using scaffold board
There are a couple of alternatives ... where scaffold boards have been used to make 8-frame boxes in a fairly orthodox way.
Yes, I've also often thought of scaffold board ("steigerhout") as a potentially easy to use building material for stacked hives. With local scaffold board I can make hive bodies that're 19.5 cm high, which is too short for BN brood frames, but you can use long screws to attach a second bottom bar to the bottom of a British National honey frame to get the right sized frame:
However, such hive bodies would be very heavy. And scaffold board tends to warp (due to which part of the tree they're typically made of), and shrink or expand in unpredictable ways that wouldn't bother a scaffolder but which is critical for beekeeping.
Also, while using scaffold board for a column hive (such as the Hancock hive) means glueing edges to edges, using it for a stacked hive would mean glueing edges to ends, which is not the strongest joint.
Front/rear opening hives
1.5 metres just happens to be the frame length in this hive, which was made by Polish prisoners-of-war in Cumbria, England during WWII...
You can actually count the cells on those combs, and if you do, you get this:
* if it's all worker comb: 16 cm wide x 37 cm tall
* if it's all drone comb: 19 cm wide x 46 cm tall
So, about the same size as a Langstroth hanging vertically. Not 1.5 metres, I think.
This is one idea I've had - it's essentially a one-box framed Warre hive, where the boxes are actually 'virtual' boxes, and formed by inserting a movable floor. No need then to lift a stack of boxes to nadir another - just move the floor down a notch and insert 8 more frames...
I'm afraid I can't (yet) produce hives to the precision required by front/rear access hives. Also I think the material is likely to be more expensive because you'd need to use wood that keeps it's shape no matter what.
If you're going to build something like that, then here's an idea: instead of hanging individual frames into that hive, try making removeable "trays" by using thin multiplex, i.e. essentially hive bodies cut down somewhat so that they don't rest on top of each other but can slide in and out of the hive like drawers in a cupboard. Still, you'd have to do precision work to ensure the bees don't glue everything together... because you won't be able to just crack it open with your hive tool.
Dunno if that sort of thing appeals to you...
No, the reason why I'm considering the Hancock hive is because it's a fixed-comb hive with a narrow diameter that would also allow easy honey harvesting. I've always wanted a fixed-comb hive, as a curiousity.
I can't easily figure out what your intended hive cross-sectional area will be, but if you were to select 30cm x 30cm (internally - same as a Warre) by a length of 0.75m , that would give you a little over 65 litres.
True -- that would give you 900 cm2. What I like about the Hancock hive is that it is a *narrow-diameter* hive, i.e. like a real tree would be, hence my design's cross-sectional area of 20 cm x 20 cm (400 cm2). So 1.5 metres is tall enough for 50-60 litres. The original Hancock design's cross-sectional area is 15 cm x 15 cm (225 cm2), which is too narrow.
The original Hancock hive unnecessarily tiny. Its brood column is only about half the size of a single British National brood box, and it's three honey boxes put together are smaller than half of one single British National super.