nice job! i think your carpentry skills are much better then you let on, well i hope they are since you put all those components above your $5000 tv!
that was my biggest fear about putting stuff above the tv, i'm pretty confident, but still there's always some doubt...
as far as stands for the samsung. it's a (relatively) shallow tv, so you have a lot of choices that will work, just find one that meets your aesthic requirements.