Well if its acrylic you can look into cutting it in half. Do you have access to a router and the skill to use it? Remember, when cutting acrylic, all edges need to be really smooth if you want to solvent weld to them. Dont use silicone on it, silicone doesn't stick very well to acrylic except for dividers where strength isn't really necessary. You want to be using a methyl chloride based solvent. We use IPS Weld On products here in the states, dunno whats available on the other side of the pond