Our engineer checked your design drawing and think its no difficulty for producing.The mold thickness is like our normal mold 2.5mm ,it's fine for sand blasting of total tank inner surface.
I had attached the sand blasting effect photo on mold and product at attachment.we normally use 1.5mm sand,but we also have 0.8mm and 3.0mm for choose.You can choose accordingly to your needs.Like attached file,its 1.5mm.
I also attached the mold quotation for your reference.
Any questions,freely let me know.