Currently using Ikea Detolf(s) which retails for about RM170 IIRC. Got mine during sale, went for RM120 IIRC.
The Detolf(s) themselves have gaps between the glass panels, so what i did was purchase those transparent 'door gap eliminator' sold at Daiso and attach them to the panels. It does not fully eliminate dust entry, but it does significantly reduce dust collection, so much so i only clean the insides once a year during Raya. (I do that for my 1:100 aircraft collection)
Fair warning tho if you've never used Detolf(s) before, they're pretty fragile and needs some fair reinforcement to avoid toppling over.
Detolf(s) are sold with four levels, but additional levels can be added which i've seen in another thread somewhere before, up to eight IIRC.
With my current configuration, i manage to display 6 helis per level, some on the stands, some not. Could be able to accomodate more if i really squeeze i feel.
Hope this helps.
Thanks for the info..
Will try to get 1 detolf and custom it.
Currently rent one deck of my wife's deco plate cabinet, stuffed the whole 17 helis in it