Compact 3-way monitor (horizontal orientation)

As you may know I am in the final stages of my first ever build (measuring and tuning). In the meantime, I am thinking through the concept for my next project and I am thinking a small 3-way monitor with horizontal orientation, i.e. this layout:

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The conceptual requirements are:
  • self contained (i.e. electronics i.e. amps, crossovers built in) stereo pair
  • as compact as possible: dimensions as small as possible while still fitting the plate amp and drivers
  • very good LF extension (this is in conflict with the above)
  • SPL low to medium (no high SPL should help the above)
  • simple (to make) cabinet. Sealed box.
  • cost low to medium (i.e. low to mid tier drivers, MDF as main box material, cheaper electronics if available

Questions:
  • what are the options for plate amp and crossovers module? I am only familiar with Hypex FA series and from those it would be either the 123 or 253. They are both 360mm long, which would dictate the minimum size (width). I would like to find similarly featured options cheaper and smaller, if available
  • what would be a few driver options for each channel?

For example, if the overall width is 36cm, then a abt 20cm woofer can be (tightly) accommodated, together with a abt 12cm midrange and abt 5-6cm tweeter (typical tweeters with 10-13cm plate would not fit). Woofer chamber will need to be small, which would limit the range of suitable woofers, I suppose.
 
I like building smallish sized speakers, but I use them with a sub. Why do you want this all in one speaker? Where will you use it? On stands out from the walls, or sitting on a desk, or shelf? Is running speaker wires that much of an issue, or do you just want to be able to move the system around quickly?
 
what are the options for plate amp and crossovers module? I am only familiar with Hypex FA series and from those it would be either the 123 or 253. They are both 360mm long, which would dictate the minimum size (width). I would like to find similarly featured options cheaper and smaller, if available
I am partial to the Hypex plate amps, but there are other options which are less expensive... and which are smaller.

The amp board from @uriy-ch is a good option. Another good option is Zoudio AIO4CH, there is a thread on it if you search.
 
I am familiar with the Epique in Dayton Audio range and the 7in Epique version looks cheaper, has higher excursion but smaller diameter/area. Indeed, a similar solution, slightly larger. Smaller chamber on the Epique.

If 8in can fit, what about this one:

https://www.parts-express.com/Dayto...400W-RMS-DVC-Subwoofer-2-Ohm-Per-Coil-295-708
 
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