Usually, the String resources in nopCommerce can not be different for the variety of stores in a Multistore setup. An easy workaround for that is to duplicate the language and limit one language for each store. This way you can change the resources for one store without it affecting the other.
The Venture theme has a custom layout for the subcategories on Category Page. Unlike every theme in nopCommerce, we have created an out of the box banner, which is actually the main image of the category and the subcategories are displayed as simple links. There is no setting, to change this layout but if you like you can create custom Carousels(with our Nop Carousel Plugin) and add the subcategories as category items there. This way they will have the same design as the Category boxes on Home Page for example. Have in mind that in the Nop Carousel Plugin has conditions, with which you can restrict each carousel to a different category. If you are having difficulties setting that, you can always submit a ticket to our support team ad we will be happy to help you.
Unfortunately, there is no way to add the With Pictures layout to a template with Custom Links simply because custom links don't have a picture attached to them. The Pictures template can only be added to menus that display Categories, Manufacturers, and Vendors.
The Cloud Zoom Plugin has such functionality. You can see it here:
You can enable it from the Administration -> Nop-Templates -> Plugins -> Nop Cloud Zoom -> Settings -> General Settings and check the Enable Picture Thumbnails To Be In JCarousel checkbox.
You can change the number of visible products to 8 by going to Configuration -> Settings -> All settings (advanced), then search for this setting: cloudzoomsettings.numberofpicturethumbnailsincarousel-venture and change i'ts value to 8.
There is a setting that disables the lazyload of the images. You can disable it by going to Configuration -> Settings -> All Settings (Advanced) and search for that setting: sevenspikescommonsettings.lazyloadimages.
In the Mega Menu Plugin for version 4.2, you can create menu items with topics and any links you want and can structure them in any way you want with the drag and drop function. If you like, take a look at the documentation of the plugin:
I believe that there will be no problem to set up the menu structure you want.