Polo bike geometry + addons

Without knowing anything about building frames, as I understand it:

The longer the seatpost (and therefore shorter the seattube), the more torque you are applying to the seatcluster. So the longer you make it, the more risk of snapping the seatpost or damaging the seatcluster.

But the advantage is the shorter the seattube, the stiffer the frame will get, and of course a marginal weightloss, from having less tubing.

This. It's why a lot of road frames are now using the compact design.

There's the obvious limiting factor of the seatpost length. I've designed mine for a 350mm to be on the max when I use it. I also tried to work out how low it would have to be for the brake lever to avoid the top tube if I jackknife.

Here's my geo - https://www.lfgss.com/attachments/59379d1349475325-line.png
Front triangle is built, just waiting on some material for the dropouts and it can be finished. I'm a little worried about the wheelbase, but as I'm making the frame out of some scrap it's not too much of a worry. If this geometry does work I intend on sending it to Mielec for them to make it.