Colin,
I am flattered and delighted that my previous essay gave you something to think about. Supporting work for that essay and this essay are posted to viXra.org. The paper names are "Quaternion Dynamics Part 1 and Part 2". They can be found here:
http://vixra.org/author/gary_d_simpson
I'm not sure yet what to think about the statement that you mention is Jonathan's essay. He speaks of the hyper-volume of a hyper-sphere being maximized for n = 5. I was not aware of this when I hypothesized a 5-D geometry. He also uses that as a rationale for dimensions becoming small for n > 5.
I look forward to reading your essay ... you better hurry, the deadline is approaching.
Best Regards and Good Luck,
Gary Simpson