Design me engineering products for my Engineering company

Hello guys

I am a financial officer at an Engineering company in Harare, Zimbabwe called Mamsen Engineering (Pvt) Ltd. I am competing in the following industries (Tobacco processing, Agriculture, Mining, Automotive, Construction, Steel works, General Engineering).

For this project I need the above for the following product

Skid Tanks (for diesel and petrol)
30,000 Liter
15,000 Liter
10,000 Liter
5,000 Liter
1,000 Liter

Please refer to photo but please be advised that I want something you recommend , the best and most competitive and cost effective.