The bogie centres are drawn on a piece of paper, and the various fittings which you wish to fit, such as battery boxes, gas cylinders, brake gear, dynamo, etc. are added. These show where the cross members should best be located. If you have a computer, a neat drawing is easily done, and this may be repeated for each coach of the same type. Fold up the bearing support housing, with the half etched line on the outside of each fold. The brass bush (these are included in the bogie kits) is fitted into its hole so that the flange is against the narrower leaf of the housing, which fits between the lower flanges of the channels. Thus the face of the bearing is below the under side of the frame. Some solder can be used to lock the assembly together. With the paper layout glued or taped onto a piece of hardboard, drill the bearing positions with a 2mm drill and bolt the housings loosely into position. Before folding up the cross beams check the width between the solebars of the coach. It may be necessary to file or snip a bit off these, if the coach is rather narrow. And this is much easier to do before the beams are folded up. The four cross beams with tapered bottom flanges slip onto the brass channels on either side of the housings. But before the second housing is thus located, slide all the other cross beams on, fitting them whichever way round will suit the varoius bits to be attached. The 2 beams with the extensions forming the body attachment brackets are probably best fitted next to the bogie pivots. They might then form the supports to the truss bars as well. When all is positioned tighten the bolts to the hardboard, and finally adjust the cross beams. Then with a light touch, solder all the joints. Release the bolts and solder on the other side. Wash the underframe in a neautralising bath (3% caustic soda). Hang all the other fittings from the underframe as required. Truss bars may be mounted on flat strips of brass soldered across the tops of the channel sections. The truss bars are made up with a top member of angle section which fits in behind the solebars.