CONVERT A TOP OPENING GLASS TANK TO A FRONT OPENING TANK

One option is to make up a timber sliding door frame (for sliding glass or Perspex doors) , turn the tank on it's side (top becomes the front) ,
remove the mesh lid (bin it) ,
fit the light fittings to the PLYWOOD false ceiling (top under glass ceiling)

ie see this generalized layout :


materials :
* sheet of 3/4" marine plywood offcut , precut by the trade desk at your local hardware shop (for front and new tank CEILING (under glass ceiling)
* soda glass 6.5mm thick cut to size and smoothed on the edges , holes predrilled for finger holes / lock
OR
Perspex 6.5mm thick or acrylic 6.5mm sheet clear (UV STABILISED) with smoothed edges and predrilled holes
* plastic tracks ie https://www.cowdroy.com.au/product/p02624-plastic-track-set
* mesh for the warm air (top) vents
* cupboard vents like these https://www.ebay.com.au/p/2-Pack-Cupboard-Vents-Round-40mm-Plastic-White-Circular/1891412126?iid=160985134725&chn=ps for the lower cool zone air vents.
* some 66 x 42mm x 2.4m F7 FJ H3 LOSP Pine Primed to make bottom slip in lip
* some silastic to glue the frame in place so it doesn't fall off.