At the rear of No. 3 funnel's Deckhouse is a trunk vent like H23A but only half height and entirely within the bulkhead.

To make this vent you must first remove the rectangular section molded onto parts H13 and H14. This is the model's representation of the crew stairwell that existed here. See DOORS section (doors to be modified) for details.

First glue H13 & 14 together then saw off the stairwell piece and clean up with a file and sandpaper. There are now two options to make the new vent.

Option 1 (scratch build part):

Use a piece of sheet plastic cut to the width of a H23A and a height equal half the height of the bulkhead.

To simulate the grill pattern CA glue a seat from a spare GMM photoetched bench over top of your new sheet plastic vent.

To create the upright glue spare single bars from GMM railings onto the front. Paint to whole part white then the grill sections Gary.

Option 2 (Tom's Modelworks vent):

You can glue this directly onto the bulkhead and paint the grill sections Gary or create a more realistic vent by removing the section of the bulkhead behind it as follows:

After slicing off the stairwell glue a single piece of 0.40 x 0.40 Evergreen rod behind the bulkhead approx. 2mm up from the bottom. This will give the bulkhead added strength when you cut out the section for the vent.

Measure the vent and mark this up on the part. It is essential that you make the hole slightly smaller than the vent so that there is an over lap that the vent part can be glued to. Cut on the inside of your marks so that you can file the hole bigger if needed.

Glue to the bulkhead and paint white along with the bulkhead.

Also paint the interior of the funnel three Deck housing black to give the illusion of great depth.