Consulting on a 3D web viewer with threeJS or other javascript 3D library

2-3hrs Consulting on how to create a 3D web browser viewer using babylonjs, threejs or other. The goal is to create a cost estimate for building a front end only 3D viewer of 3D objects. The backend is built on Django and is already completed. The goal is to create individual 3D maps each map will visualize either elevation model with texture, plus we need to plan to include functionality add 3D objects( possibly Collada) to scene such as a bridge and position that bridge in the correct location inside a model. We would also like to add a annotation x,y,z point layer to the map so we can add a type of 3D label to the models that can be edited. These 3D labels are shown in a popup showing information and includes the ability to add images or PDF attachments to these newly created 3D points that the user would add by clicking inside the scene. Each of these are then stored in the backend as a 3D map along side the 3D objects, and 3D annotation. Current status is that the web application is already online. We have the backend that works using Django, Postgresql and a front end built with Twitter Bootstrap, Jquery and some ThreeJS 3D viewer attempts. The consultant should have very good Javascript experience and experience with ThreeJS or Babylonjs or some other 3D webgl Javascript library.