here's one of my personal orchestral template.
It use plogue Bidule as host (because some special KeySwitch configuration) and EastWest Hollywood orchestra and East west Convolution reverb (but you can replace it by another one).
You can use this template and associated files (soundset etc..) as this or use it as a base for designing you own and take inspiration from it.
Attached you will find and audio example of the raw output of the template, the template itself (.opmo), the Bidule file and the soundset necessary to drive this template.
Put the BaseOrch4.bidule file into the Instrument/Templates folder from Opmo folder. (create the Template folder if not exist)
Put the soundset file BaseOrchestra4.lisp into the Def-soundset folder from opmo folder.
Have fun !!