Planitherm is not a single product but a brand collection of low e glasses. Visible light, solar gain and heat retention specifications differ between different Planitherm low e products. Finding out which Planitherm variations are available in New Zealand and what their specifications are would be useful. Specific low e products should be chosen and specified or else the glazer could install anything with the Planitherm name on it.
Overseas it's possible to combine the low e glass with a higher grade of clear glass but that would cost more if it is available.
I've seen this multi purpose cool drawer product and thought it looked really useful
It's very expensive in retail but may be much cheaper through the builder.
I suggest changing the gas cooktop to this flushmount model
It won't have pots precariously sitting up in the air like their gas on glass models. If the price is unreasonable you could get the very similar Smeg model.