Yes I do take the black triangle approach to development. A long period of solving problems and de-risking and learning stuff. Nothing tangible to show but a bunch of solved problems.
Next step, tie all the solved problems together into a working solution. Relatively speaking it's actually the easy bit.
From your answers it would appear that you are on the brink of seeing your idea come to fruition.
If it is any help, try to integrate each technical area one by one into the complete application. The incremental results might give you that extra shot of energy seeing the finish line so close.
Next step, tie all the solved problems together into a working solution. Relatively speaking it's actually the easy bit.