More people posting here are women, FYI. To advise you on this window, we would need to know your goals. What room does this window serve? Do you need light, ventilation, noise control, security from intruders? Will this window be glazed? Where is the structural header and can it be altered? How does the rest of the facade look, where are you located, is it important to coordinate with the style of dwellings nearby? What direction does the window face and is it shaded by other buildings or trees at any time of day?

Hi. I'm not so great on these technicalities :-). I think the one in the picture uses wood, and placed vertically like that I think the slats would have much more strength than if they were flat. But I don't think even really hard woods would stand up to coconut pounding for long. Perhaps if you could find someone in your area that makes security gates like the one below, you would be able to source the slats they use through them (again, no doubt these slats are made from a variety of materials, you would have to find a tough kind).

This is a great space to work with. Since you have a good length, you can break the terrace into rooms.. with yew to divide the areas, or tall plants with shallow roots. Grow grass in curves and a pathway to lead visitors through the various rooms. Couple of ideas for garden 'rooms': Bamboo with golden stem or black stem as background, with charpai and 'moda' seating with cushions. A light under the foot of the bamboo, looking up will be alluring. Put up a trellis with fragrant climbers like jasmine and seating underneath on a part of the terrace which gets shade in the evening so you and your friends and family can relax. A dry garden with hardy plants like tall grass and Palm tree, pebbles on the ground to create the look. Plant a small flowering tree in one 'room' Add evocative lighting to create the mood in the evenings. As you can see there are many possibilities. Please ensure the ground is well protected from water seepage etc before you start planting. Also ensure the height of the periphery wall is taller for it to be safe for children and adults. Bear in mind the size of the plant, roots, sun and water needs before you choose your plants. Enjoy the creation..!

For your family - create an entry hall and mud room - consider a wide free standing two sided "bookcase" or other wide screen piece centered in the space, just about 9' into the room, to screen the rest of the room. On the end wall, near the kitchen, try a hall tree with a bench and hooks and use a mirror over a pretty sideboard on the front wall. Shift the dining room table closer to the entry and kitchen, making the family room larger.