Gentleman thank you for the compliments. Chris, it doesn't take any great skill or kit. What I found that works best is the measure twice cut once method. I used sheet styrene for the sides, ends and floor. Square styrene stock cut to length for the side and end ribs. The side ribs were cut on one end for the taper, individually. Next time I will devise a jig to make all those cuts the same. Stripe styrene for the top channel to cap the side ribs. The grab irons are 'Tiny Tot Staples' which are no longer made. The best tool I had was the scale ruler for my measurements. A good set of drawings help in the scale you are building but I used HO drawings and converted the measurements with the scale ruler. It sort of became a kit, since I fabricated all the ribs at one time, cut the sides and ends. It became a matter of gluing the pieces together. This one turned out a bit better than the previous car, IMHO. Some of my early works were pretty crude. Practice and don't be afraid to try it.
Cheers,
Greg