Basically it will be a secret door entrance on the base level of Proudspire manor, a similar set up to the blades hide out at river wood. The closet/secret door will a have stair case that will lead down to the crypt were there will be a coffin for your vampire character to rest. The coffin will set on a tiered floor kind of like it does in Alva's cellar.
I'm not advanced enough to make this happen, I can help with testing if a talented modder wants to take up this project. I have played through the DG dlc and the castles are not really that good imo, I still think the player houses are better I just want to make Proudspire a little more fitting for my vampire lord once Dawnguard comes out.
I'll donate a game of the modders choice via steam as a gift.
Edited by Kinjoson, 20 July 2012 - 07:55 AM.