Voxel painter with custom 3d text

I need a voxel painter to create a special output in the form of an interactive web app. It must have special features and be able to render 3d text. I have a concept of what the 3d text should look like but it has yet to be decided and designed. The output I'm looking for should be an html page.

The voxel painter is based on this repo:
https://github.com/vonerikbarren/THREE_VoxelPainter_UI_UX

The working voxel can be seen in the demo pages here: https://threejs.org/examples/webgl_interactive_voxelpainter.html

The actual work:
There are some features that need to be added to the voxel, the missing features are as follow:
a) I should be able to rotate the view, by using the "shift" key and the mouse, I should be able to rotate the view and view it from other angles
b) I should be able to place more "boxes" by keeping the mouse clicked. In other words by leaving the "left moused clicked" and dragging, the boxes should be placed automatically instead of individually clicking on each space.
c) I should be able to place "boxes" with a custom legend that I can update, there should be a list somewhere that if I update the text in "the list", the label in the "box" should be also updated in the 3d space, the boxes with labels should be able to be in another color.
d) I should have a button to save the layout that I draw
e) I should have a button to load the layout I saved