Hi, intrepid barge-builders
Tim, some of the questions seem to suggest that you do not have the "plans" for this boat issued by Billings
They are heavily larded with copyright notices, so I will not copy and paste, but they are available here
http://billingboats-direct.com/estore/product_info.php/billing-boats-b601-will-everard-sailing-barge-model-boat-fittings-p-601and for all their failings they do at least have assembly pictures with part numbers
F694/1 is the stove chimney - it has a top piece B2/16 (??) and is prolly a length of wire or tube with a couple of bend
B2/68 is some sort of mushroom vent and fits next to the chimney pipe (page 11 of the instructions)
Incidentally, you are not there yet, but the rigging instructions contain one glaring error which would cause you to scratch your head and leap to the forum. On page 14 the spar labelled Bowsprit is in fact the Sprit (pronounced spreet) that holds up the top outer end of the sail. This particular barge does not have a bowsprit, but like all Thames barges it is a Spritsail barge
Going back to your original query about the pieces called 22. The parts list says they are 1.8 x 5 obechi wood and they are shown on page 7 of the instructions. They are sort of handrails (footrails?) and fitted at bow and stern on top of the planked sides, so they will need a bit of bending (forming). cut to size, soak in boiling water and gently wrap round something curved. Hold in place till dry with rubber bands, PVC tape or anything else that will hold it in place
Viola! Formed handrails
Hope this helps
andrew