LR print module - how to make a grid of photos w fixed height but different widths

In LR Print module, I would like to be able to have a grid where each cell has the same height but different widths.  This template should be create automatically on the fly from the selected photos, so each photo is following the previous one with no gap with a fixed height but a different width to respect the ratio.  Ideally each row which will have different total width should be centered on the page.

As an exemple of what I want to achieve, you can see on my website where the strips have all the the same height but different widths.
I don't think this is possible to achieve in the standard version (with no plug-in), but is it possible to add a plug-in that achieves that result?  I program in php/js/html... but I do not know Lua at all.  Not sure about how easy it would be.  I think that this could be very nice project to develop to print poster of series of images.  Any developer interested?