Sure, I'll try to get pics up. But just some observations if you don't mind...
I know nothing about properly identifying anything nihonto for school, date, maker, etc., though I've been doing a lotta homework to at least know what little I can about what we selected and why. (Interestingly enough, in all of this I've moved from an insistence on the Nobuiye and Kaneie scenic-type solid plates to a beginning of an appreciation for sukashi, tho I still haven't mustered any understanding of all the excitement over Akasaka, etc.)
Re: the dragons, maybe start here where Brian breaks down the basics
viewtopic.php?f=2&t=20328
And check out Chen Rong's Nine Dragons here (you can scroll the entire panel below)
http://www.mfa.org/collections/object/n ... gons-28526
Re: fuchi size, your koiguchi may still be larger than your fuchi, but it won't have to be a lot larger/should still blend well.
Re: fittings, our original blade was from a western smith and we had originally considered Lohmans fittings for this, but then realized that for a little more we could have original. Moreover, since being captured by tsuba years ago, I've always wanted some shibuichi and shakudo--and for warmth/texture/color, cast reproduction just couldn't compare. We rationalized...new western blade, old Japanese fittings, blending...so yeah, you WILL rationalize, maybe especially re: theme. Of course, once we decided instead on a Japanese blade, cast repros were never an option.
Re: our build, I can only tell you what we went through. Our same and silk ito are from Namikawa/Hebei in Japan (wonderful), our tsuba from Haynes, our FK from Ian C here at the boards, our menuki from the recent sword show in Philly, our blade from AoiArt, our saya billet from NWTimber (recommend maybe Namikawa/Hebei's precut blanks unless you have access to a bandsaw), our sageo from some god-awful place that charged ridiculous shipping (only place I could find the cord in natural fiber), our seppa nickel silver plate from some jeweler's place, and our buffalo horn from Nihonzashi.
Re: shirasaya, our blade will rest in this. We'll make a wooden blade to hold the koshirae with it.
Will try to get pics up soon. As for what looks good, only you know. "The more you look for truth outside yourself, the further away it gets."