Thanks for the replies, guys.
Oznappies - did that structure mean that all your subproduct pages were pretty much devoid of link juice? Were they even indexed? The big question is if someone searhed for 'red product a' which page showed up? Excuse my ignorance re the canonical stuff.
Ryan, Yes you are right to some degree. I am reverse engineering the website so to speak. But nevertheless I plan to offer huge value to visitors - I have spared little expense with the content writing, usability etc plus we have some fairly radical ideas that should be hugely popular with the visitors.
But I take exception that this is the wrong way to go about it. SEO = Manipulation doesn't it? The old adage 'Just make great content then users will find it and link to it and you'll dominate the serps' is a great theory but we all know in practise it doesn't work like that in 99% of the cases. To get your great product out there you have to give it a push, find an angle to exploit and this targeting of long tail is my angle.
It will be a great site I assure you