I found more details about this manufacturer "Beevatech". Apparently they are one of those larger local manufacturers of these vehicles in BD.
They claim that they are selling around 1000 e rickshaws a month. Now even much larger manufacturers like Atul Auto (one of the smaller three wheeler manufacturers in India) produces only 4000 units per month. Hmm...
But one will start doubting those claims if he/she visit their 'plant' located in a shantytown in Dhaka.
1000 per month? Or year? Or in 3 years?