Custom startup theme issues changing dimensions of elements

[Madhead]

I'm trying to create a custom startup theme but the truth is I have very little idea how to edit these xaml files. That said I have made some progress. The presentation is more minimal now, which is the way I wanted it, with the "Now Loading..." text in small font at the bottom left corner instead of being bang in the middle of the screen in block capitals. Only thing is I hardly know what I changed to get there. I don't know how to reposition the grids, I just entered a value and it defaulted to the bottom of the screen and I aligned the x,y text to the Left and bottom. I'll include the startup theme xaml's so a more knowledgable person can see what I did, but in the meantime this is what it looks like:

 Which is pretty much what I had in mind. The issue is that the clear logo grid is too short which means logos that are more square in size appear way too small. I'm trying to increase the height of the grid.

That's an example of how the grid currently is and how a square logo appears on the screen. I'm simply trying to increase the height of the grid while leaving the width the same. Maybe twice the height, that way both wide and boxy logos appear a nice size on screen. If anyone can help me out it would be appreciated. Cheers.

Custom Startup.zip