HI Grandpa, if you mean the entire pulpit railing from cabin to the bow and round.
First measure the deck, marking where each upright will be, the uprights seem to be the same height, so that part is easy, source some 16g welding rod, (stainless will be to difficult to braze) then shape to the size of the deck, try to keep the bends smooth as it may kink.
Second. Get a scrap board bit bigger than your deck, mark each stanchion position and drill holes to match, stand the stanchions in the holes and start to lay the top rail silver solder for strength each stanchion as you get to it, might be easier to work side to side towards the bow, this will stop you burning your fingers!!!!
To finish you could have the rails chromed or use a chrome spray paint, can't tell if the rails have feet (small washers) if so add these over the stanchions before you solder the top rail, they will stop them going too deep into the deck, finally drill and glue the railing into the deck, a sod of a job but the look will enhance your model
Hope this helps

Mark