I am building calculator functionality in my website and used my coda embed function to show the calculator. I have tried grid.is as well to do the embedding. Actually, Coda can and should implement grid like functions so that you can show the figures/sliders/charts side by side. Coda has so much potentials if this function is added. Hope Coda will consider and add this to their product roadmap!
You could play around with layouts to get some content side by side. E.g. see this thread as an example:
Hey Paul, thanks for pointing that out.