I tried using an existing bench and just replacing the mesh, but that took away the little wireframe guys... How do I go about adding those? It doesn't list any markers... see the image below:
http://bit.ly/nomarkers
The Furniture markers are a part of the NIF file - you can easily copy paste the blocks from an existing seat into your NIF by right clicking on the BSFurnitureMarker and doing a block - copy Branch on an existing furniture NIF and then with your NIf open in a second instance of NIfskope highlight the 0 Ninode (this is so it will paste it as a child of the main NiNOde of the NIF) and then doing a right Click - Block - paste branch. Just look for a NIF with the proper number and placement of markers to copy (can be adjusted manually to different positions and add or subtract positions but is easier if you just use the correct one to copy paste.
If you need help figuring it out - upload the NIF somewhere and send me a Link via PM along with a description of what positions you want the bench to be able to be sat on (ie. just one or 2 and can be activated from all sides or just in front etc.) and I'll put it together and send to you.