A Discovery regarding donor kits that you only need a few parts from...
Call Tamiya at 1-800-826-4922, then press 2 for Customer Service. Say you'd like to order a replacement part. Say it's the Tamiya 1/35 King Tiger which is Kit # 35169 (Porsche Turret) or say it's Kit # 35252 (Ardennes Front Turret), but EITHER WAY it's the same upper hull part you want, and on both models that is part # 0443157 and it is in stock for $5.15 plus $5 shipping. You've just saved $44 off the retail price of the whole kit, and there's the back of your Y-Wing Fighter in Studio Scale. If you want the door, you have to order the appropriate sprue (Sprue C, Part #38), or you could just make your own door. Most likely you already own the whole kit, so really all you're doing is buying back the one piece you need to resell that kit to someone who wants to actually build a tank model.
Say you want the gun-emplacement turrets that ride on top of the T-bar for the engine-nacelle hold-downs? That's Sprue F of the Tamiya 1/35 Panzerkampfwagen III Ausf. N (Kit #35290, now that the Ausf. M/N is out of production), and is $6.30 per sprue (and you'll need 8 of them, or one plus some resin-casting skills). See the whole manual/instructions they uploaded at
http://www.tamiyausa.com/pdf/manuals/35290ml.pdf in case there are other parts you want to order.
The British Centurion 1/25 Scale tank (Kit#30614) is out of production, but Tamiya still has sprues C, and L. Sprues A, D, J and K are out of stock. Sprues C, J, K, and L are the ones you'll need - the available sprue B is just wheels and sprockets, none of which are used on the Y-Wing.
