Trimming bi-fold doors


I've been looking for bi-fold doors for my nice new but very compact bathroom. Unfortunately the door frames in this house are all metric sizes, this one being 726mm(28 3/4") x 2040mm (80 1/4"). Days of searching the net has revealed no supplier or manufacturer of metric bi-folds.
BUT there are plenty available at 762 (30") x 1981 (78"). The height can easily be accommodated by adding to the door frame. According to the fitting instructions supplied with ones in Homebase 9mm can safely be trimmed from either side. Would it be reasonable to remove the central hinges, remove 9mm from each of the four sides and then replace the hinges?
The central stiles are the same size as the outer ones so I cannot see why not. Just want reassurance before I shell out.
Anyone foresee any problems??
TIA
Stuart
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had to trim 7mm off each side of the doors. The only problem I experienced was that it revealed, some of the comb joints in the upright stiles, and the holes that had been drilled through the stiles for the dowels to secure the horizontal frames. Thease were easily filled, but still show slightly on the varnished door. You do need three point hinges, as these door have a bit of a tendancy to warp once out of their plastic packaging. David
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