Need some Ideas.

Im going to be working on this car tom and installing an 10" RE and apline amp.
Has anyone ever worked on this car. because I would like to put in a false floor for the amps and maybe put the mazda emblem ( which i plan on making ) on top of the false floor.
Any ideas guys, also im plan on using a hi-lo filter and taping into the back 6x9s. Is there going to be a problem, because Ive hear others have had problems.

And designs or pic would be great.

Thanks Guys