Just to put this into perspective, the Pedersoli pistol kits are 95% finished.
IMO, while the metal parts appear to be rough, there is really not a lot of metal which requires removing. I believe one could get by without filing much if anything and end up with a nice looking gun.
firedanse: If you want to buy a file for working on this kit, I would recommend a 8 or 10 inch "single cut, flat, bastard file". Another file which will work very well is a 6 or 8 inch flat file which is designed for sharpening chain saw chains.
Make sure you get a handle for the file. It goes on the long pointed tang and does 2 things. It gives you better control of the file, and it keeps the tang from poking holes in you hand.
I am sure you have noticed that the stock wood in the kit originally stands proud of the metal where they meet, so before going to all of the work of sanding or filing the metal nose cap etc, I would recommend sanding the wood down with the metal part installed. Useing the rougher sandpaper, start sanding the wood down until it is almost flush with the metal part and blends smoothly into the metal parts contour.
At this stage, switch to the finer sandpapers to smooth the surface and remove the scratches left by the rougher paper.
Try not to "undercut" the wood below the metal part. Undercutting can happen if you try to sand the wood without the metal part in place.
Although sanding the wood with the metal part in place will scratch up the metal part, the metal part will limit the amount of wood you can remove so it will end up being a continous smooth assembly.
The use of a sanding block (a small flat piece of wood will do) should IMO be limited to the flat sides of the stock where the lock and the sideplate are.
Because this stock is 95% done, let its contour (which is rounded almost everywhere) tell the sandpaper what the shape should be. This means don't use a hard sanding block on these contoured surfaces. You don't want to create a bunch of flat surfaces on what should be a rounded contour. Use you fingers to provide the support to the paper in these areas.
For the metal parts, I would suggest buying some of the black colored 220, 320 and 400 grit "wet/dry" sandpaper for finishing the metal parts.
Start with the course paper. When the finish looks uniform, go to the next finer paper. Try not to round off the sharp edges where the metal will meet the wood.
By the time you have finished with the 400 grit paper, the metal will have a nice soft luster to it. From there, rubbing it with a piece of cotton cloth and some Wrights Silver Polish will bring it to a mirror bright shine.
Do not sand or file on the lock. It is color case hardened so sanding on it will damage it's good looks.
Be sure and read the posts by StaticXD00d
here's a link:
Pedersoli Pistol Kit