Hello,
Here's my too old project with Tamiya 251/1 and some extras. I've been building this every now and then. Maybe I started it too ambitiously as my skills weren't up to the challenge 5 years ago

 Well, ain't that great even yet but I'm trying hard...
Well, hopefully you can see what is happening in pics. My camera isn't best possible for close-ups.
I'll send more pics as this project comes along.
http://pg.photos.yahoo.com/ph/nikoaspo/album?.dir=/7cb7
pic 251_1
Here you should see hull without a floor and interior plates added. There will be Part's floor and floor boxes.
251_belly
Some rivets added and details made.
251_wall
Interior plate added. Afterwards I noticed a mistake I made. There should not be holes where are lifting lugs. Perhaps I change plates. Difficulty is that wall isn't really thin but Tamiya thinned only upper part of wall.
251_floorbox
First time I tried soldering and it works pretty well. More practice needed anyway

 Trick is to sand glossy surface from parts first.
251_fenders
Well, this was the most difficult part that actually has stalled the whole project. I wanted to scratchbuild fenders with lead foil. Here the original part has been measured and layout drawn to paper. 
251_floorbox_2
Floorbox sanded and ready to be folded.
251_stowagebox
Eduard's stowagebox installed(correct word here?). You may notice that box is a BIT crushed. This was intentional
251_parts
Part floorplate and some folded Royal Model parts. 
To be continued....