Hello,
I wrote earlier called elektroGame (2D educational mmorpg - themanaworld fork). Now I plan to write in 3D. Esenthel seemed appropriate. However, I have some questions.
1 - Is it possible to have a GUI on a simple electrical circuit simulation?
2 - Server on simulation scripts written in the XML data to send to the client?
3 - Should there be insufficient eAthena server to use the server as possible?

Thanks
(sorry my English. I can only read )
sample for question 1:

For #1 and #2, I would recommend downloading Esenthel 2.0(you can demo it for free). You can see for yourself if the EE features work for you.

I don't understand what you are asking in #3.