You have three different laminate floors. If you want unity, you need to decide what will give you unity faster. The floors are close enough to ignore there differences. Without seeing the wardrobe units I can only guess what will work best. Add photos of the units you are contemplating and you will get more responses.

sorry that is wardrobe door colour

That explains his opinion. Your description until now was for outlay doors. Slideline 16 is capable for 50-60 kg and 18-24 mm doors only. As I said earlier, not a big fan of bottom running sliding systems. Hope it works fine for you. Steel decorative strip is possible . But avoid deep cuts on the door that would increase the chances of bend/warp.

You are in tight spot in terms of dimensions of the Guest bedroom, there is not much flexibility except for the pantry outside room which can have an additional wash basin as suggested by Nitin from corner stone above. Although, since its guest bedroom, TV viewing might not be priority unless you are looking to use it as your entertainment room for family. If you are planning to use it as entertainment room, then, instead of full fledged wardrobe you can have long wardrobe wall unit upto 2'-9" height for storage & TV/entertainment arrangement & play around the space above. In this case, you need to shift electrical & cable points to wall marked for wardrobe.