Ron wrote:

The Moxen rectangle is still a little too large.

If it's really only a little too large, you might consider the earlier
VK2ABQ which is square rather than rectangular, and thus has a slightly
smaller turning circle. The performance isn't as good as the Moxon
shape, but it will fit into some spaces where the Moxon won't.

Any thoughts on just center loading the elements of a yagi? Anybody
ever tried or know how to calculate element lengths or required
inductance?

It has often been done. The method of choice now would be to decide how
long the elements and the boom can be, and then experiment with various
loading configurations using a modeling program. As the elements get
shorter, remember that (a) the losses increase, as in all loaded
antennas; and (b) the shortened elements no longer interact in quite the
same way as full-length elements do.


--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
Editor, 'The VHF/UHF DX Book'
http://www.ifwtech.co.uk/g3sek