Kudos to TS and bro Occellaus for taking time to take photo and share with us step by step on measuring and cutting of acrylic...
For me i did it the lazy way..i just aga aga gauge the distance from one end to the other right before the overflow and cut a rectangle shaped one...so have some black base for my rays also
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I live ard jurong area so went to another shop instead Ying Kwang Acrylic Trading...those living near the west area can try that area...got MM on 2nd floor also