Wayne,I would categorize myself as a builder rather than a designer. So no Spice for me!
Being a "Spice Guy", I hope that you will find John Broskie's TubeCad website very informative, since he is a Spice Guy too.
Brian
P.S. I really enjoy the friendly environment that you have fostered on the PiSpeakers forum. Now that Listener magazine is gone, the Pi forum is first place I go to get my DIY fix.