The dimensioned physical constants (G, h, c, e, me, kB ...), can be considered fundamental only if the units they are measured in (kg, m, s ...) are independent. The 2019 redefinition of SI base units resulted in 4 physical constants assigned exact values, and this confirmed the independence of their associated SI units. However there are anomalies which occur in certain combinations of these constants which suggest a mathematical (unit number) relationship (kg -> 15, m -> -13, s -> -30, A -> 3, K -> 20) and as these are embedded in the constants, they are easy to test, the results are consistent with CODATA precision. Statistically therefore, can these anomalies be dismissed as coincidence?
We begin by assigning geometrical objects instead of numerical values to the Planck units, these objects can then be combined Lego-style to form more complex objects, from electrons to planets, while still retaining the underlying attritbutes (of mass, length, time...). Solving the constants using this approach provides evidence for a unit relationship.
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Preprint Physical constant anomalies suggest a mathematical relations...
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Some general background to the physical constants.
Article The physical basis of natural units and truly fundamental constants
Article Trialogue on the number of fundamental constants