Wow!Here are the final products.
The smaller one using Audio Nirvana Classic 10" drivers double up as Home Theater center speaker. The bigger ones have Audio Nirvana 15" cast frame drivers.
The sound is very close to what I have been dreaming about since the past many decades. The human voices are very detailed and intimate. The plucked strings are realistic and grab your attention. You can identify each instrument and string distinctly. The bass is controlled, detailed, fast but subtle. There is enough of it to make the Cello resonate your sofa, and the drums to sound real. I loved the the sound signature of my Monitor Audio RS6/NAD. This set takes it further in the same direction. I would not want to boast too much here, but it works for me. I mostly listen to Vocal Jazz, Ghazals, Hindustani classical and vintage Hindi music.
One good thing for me is that the vintage gems, such as old recordings from Ustad Bade Ghulam Ali Khan and Ustad Faiyaz Khan, which were unlistenable because of the poor recording quality, are much more listenable on these speakers.
My latest creations! Single full-range driver based classic speakers by Sharad Medhavi, on Flickr
regards,
Outcome of the speaker box is superb.