We went different way slightly, I made an agreement with furniture company, contractor and HVAC/ security company that we make show home and they can use it to show some of the work for their customer but in return they will not charge for the system or work they will do, it was hard at first but they agreed finally.
Now we have a small house which has 5 theaters between FP system and Plasma.
bathroom with waterproof TV and audio, entrance with mirror TV.
Whole house audio video system, touch screen remotes and so on.

now with the cooperation of the other companies we can provide everything including constructions by the contractor, furniture by the furniture companies (including kitchen hardware).

We don't get many customers who wants the full package but for sure every customer walked into the show home will choose something weather its the multiroom system or HT system, control system or light system.

We even converted one room to home office and its becoming popular now.

We do add and upgrade from time to another and soon we hope to add DVD server.

We couldn't do it without the help of the other companies and it took us awhile to let them join us but it was worth it, sometimes when they show their work to their customers we get some business from them as well.