You aren't necessarily going to gain extra space to store more bottles. Because you aren't changing the overall volume. Depending how handy you are. One option is to cut two sheets of material to the size of the opening, width and height - so it looks like you have two doors. Then use a hole saw, 75mm, too drill as many holes as you can get in the board leaving enough room between holes to keep structural integrity. Repeat in the second board with the same spacing or secure both boards together, temporarily and drill both sets of holes together. Finally install 4 spacer blocks to create the depth required to support the neck and base of the bottle. Fill holes and paint to your desired colour. The boards should look like a piece of Swiss cheese when finished. Well it won't but you hopefully get the principle. Hope that helps.

Personally, I'd go for a solid wood in at least 20mm thickness. Oak, ash and beech are all very inexpensive, harder wearing and more stable than pine (a softwood rather than hardwood) and, in my opinion, are far more attractive. 25-28mm thick worktop/shelve sections are very affordable, and if you plan carefully, you can get all your shelves out of 2,3 or 4m length with minimal waste. Generally come in a varity of widths from 600mm to 900mm plus, so pick based on the overall depth(s) of shelves you want, and cut down for multiple shelves. Have a look at Worktop Express for an idea on costs, though we can source the same products at cheaper, trade prices. An oak, ash or beech pantry will look heaps better than pine, last longer and probably add more value to your property. Caldicot Kitchens

Hafele do the slide hinge components. Some suppliers do these as a ready to buy type of pantry cabinet ( mostly European manufacturers) but the wine fridge will need to be smaller depth than standard if going within a standard depth cupboard. Jail.co.uk could be a fair compromise as is bespoke but without the large price tag.

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