Weiser,
I don't know if you have seen the maps I put together but you are welcome to them. Just PM me your e-mail address and I will send you the map pack of bases, towns and factories with all the objects labeled coinciding with their downtime object numbers. They could be helpful even if you are designing your own maps. It takes a lot of time to get the location of object numbers.
I chose to take screen shots over bases, towns and factories or I used the terrain editor to obtain the maps. I then added the info. You can use a graphic program and create the map using the HTC map as a guide also.
Again, you are more than welcome to my map pack if you are interested. PM me your e-mail address and I will send them right over.
Cheers, One-eye