you can lazy load components with meteor 1.5 (rc.5 is out):

import("/path/to/mycomponent").then(default => (
  <default />
))

there is even this cool https://github.com/thejameskyle/react-loadable:

import Loadable from 'react-loadable' ;
const LazyLoadedAdminApp = Loadable({
   LoadingComponent: () => <div>Loading</div>,
   loader: () => import("./path/to/mycomponent')
})

<LazyLoadedAdminApp /> // now loads when mounted!

for our admin-ui there is one gotcha, because this approach needs Loadable to be in your "app-space", not sure if it works properly when done inside an npm-package:

// app space code
import Loadable from 'react-loadable' ;

// your admin context:
adminComponents: {
   // that would work properly, but we would need to import every single component this way :-(
    list: Loadable({loader: () => import("/path/to/list.jsx")}) 
}

it would be cool if we could do this somehow in the package!
Maybe we can use Loadable in the package directly, but i don't know how meteor behaves, if you load someting lazily inside an npm package

When accessing the admin-backend without a logged-in user, a default login view should be rendered instead of a Jurassic-Park reference

Do not grant access to the admin routes for users who are not in the admin role.

Create an admin home page which contains links to all editable collections and pages based on the provided admin config at context.adminContext.config.

All default views and components provided by manul-admin-ui should be overwritable using the adminContext config of the project.

https://github.com/booleanhunter/ReactJS-AdminLTE

not sure, if this is easy to integrate, but might be worth to take a look

Migrate the existing UI components provided by the meteor-boilerplate into this project.