I am using Leaflet for maps with custom tiles with geoinformation, but as far as I can see Leaflet should be able to do this task. There are some points to consider how you should organize your images to be able to display them in a pannable and zoomable way:
First of all, you have to understand the concept behind map navigation and the corresponding tile filenames. This concept is a QuadTree. An example on how this works can be found here.
Then you have to cut your raw technical illustrations in different tiles. If you start on one zoom level only, this should be quite straightforward. You can then use the tiles in a new Leaflet TileLayer. When you want to have zooming, it might get a little bit more difficult. You will have to find out the correct boundaries for your tiles and construct the correct filenames (see the QuadTree references above).
To sum up: Leaflet should not be a problem in your task. The main task for you is to create suitable and correct tiles from your raw data.
