User input (location) inside node?

Basically I'm looking to have it so that users can place markers on a map inside a node.

I imagine it to look something like his:

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|-------------------|

Address : ________________

Extra info : ______________

Basically so the same thing that is in the Gmap Macro builder, but inside nodes that users can use, and put a limit on the number of markers they can place.

When users typed in an address, it put a marker on that place.

The marker would then display the user name of whoever placed it, any extra info type in, and a link to PM the user.

Also I'd like it if users could remove the markers if they wanted, and possibly have a part on their profile where they can see these markers (but this isn't as important).

This address is NOT going to be the same as the user location, and its not going to be the location of nodes users are using, so it needs to be an independent thing

1. Will i have to make a new node type, so that users would actually be making a node inside another node?

2. Could this be done by taxonomy terms instead?

3. The solution would have to be done in Gmap module, as I can't get Gmaps tools module to work.

Any help would be much appreciated. IF lots of custom code needs doing i would be willing to pay some money for it to be done.