I was wondering what the upper limits for adding Units and Buildings/Wonders might be. What I'm really thinking about is the "units_32" and "buildings-large"/"buildings-small" files (in the /Units and /City Screen folders respectively)...is there are limit to how many of those icons I can add?

While I'm at it, is there a limit to Resources and Technologies as well? :)

Thanks in advance for your help! :D

Welcome to CFC! :) There is a limit of 256 buildings/wonders in the editor. I don't think anyone has hit a limit with resources or technologies. The PCX files you mention can be expanded to accommodate as many icons as you need. In fact there are several huge resource.pcx and units_32.pcx compilations available to download that include hundreds or even thousands of icons.

Thanks for the welcome :) Also, thanks for letting me know about the buildings/wonders limit.

By the way, where are those huge resource and unit PCXs? :)

I made one of the unit ones...don't know where it is though... I uploaded it here somewhere

there are templates for these things in my siggy...modding templates...2 seperate libraries that I have not combined yet...

[edit] here it is:
http://forums.civfanatics.com/attachment.php?attachmentid=100944&d=1129246105

There is a limit of 256 buildings/wonders in the editor. I don't think anyone has hit a limit with resources
Actually on the resources you are limited to having no more than 32 Strategic or luxury resources or you will always have the resource overflow bug.