I have a question. (I've tried to use 'search' for everything related to my question/issue. please bear with me) With the Marcus Miller bass, if you change the preamp into an 18v pre, can you fit two 9v batteries in the compartment? To be more specific, if you use a Bartolini NTMB918F (or something like that), can you fit the preamp in the control cavity and the two 9v in the battery compartment? If not, can you fit the other battery in the control cavity? Or do you have to "cut" some wood out to accomodate such a setup? I'm asking all these because I intend on changing the preamp on my Marcus Miller bass as soon as it arrives. I've already placed an order for the bass here in my local music store (Long & Mcquade) and I've been waiting for a week now. Waiting sucks I know some of you might suggest a U-Retro custom fit for the bass but I am on a budget and I want to keep the existing knob placement of the bass. I've read about Bartolini, Aguilar and the U-Retro pre(s) in this forum and decided to go with the Bartolini. Thanks for the response.