Need help and advice to do some low magnification shoot.

[madmacro]

I have not touch my set up for a while, I am Patrick from Singapore.

I have the following equipment and I wander if I should buy better item to do a hi Res low magnification shoot 3x or 4x or 5x.

Currently I have Nikon pb6 bellow. Sony A7r, and A6000, Sony FE 90 mm macro 2.8, voightlander SL 125 f2.5 Apo Lantha, a stack shot controller sets. Large 500 watts strobe. Stage and Nikon el 50 2.8 older version.

What I want to do is to shoot insect beetle mostly and to print large poster like AO size or say 1.5 X 2 meter.

I need high resolution image and probably shoot few photo with high stack and stitch it together. My insect vary in size from 15 mm to 50 mm I think as I order them from seller.

Could you all expert teach me what I needed to fulfill my dream.
Budget is US 1500 to 1800.

Thanks to everyone here.