[DominickC]

Time to break out the 5'' drill bit!

If you have your heart set on a turret, replace that aluminum plate with polycarb - that'll save you quite a few pounds. To go further, swiss-cheese the polycarb.

Now, the plate/sheeting down below your construction cardboard can be cut and/or swiss-cheesed.

The metal plate off to the right side of picture 3 looks AWFULLY thick. Does it need to be this thick and made out of metal?

The swinging metal door you've got can go. Replace it with netting and a few staples.

That laptop....do you REALLY need a screen? Remove it and use the VGA/HDMI port when you need to service it.

Your electronics board is quite thick. Replace it with thinner plywood.

Your wheel lift kit looks pretty heavy. Swiss-cheese it.

Go crazy with hole-drilling. Also, drop some of your hardware sizes to 10-32 if you can.

Drill your aluminum support pieces

I believe Victors weigh less than Jags. If you're not using CAN, I would weigh your Jags and see if it's worth swapping some/all out for Vics.

Back to the laptop, it looks big and heavy. I'd really consider removing the screen, and depending on how much hard drive space you need, using a lighter SSD, or creating your own SSD by buying a bunch of cheap flash drives, gutting them and arranging them all into a USB hub(s). From there, install whatever OS you want and arrange your drives into a RAID array if you want only one drive letter, as opposed to 10.
Remove the CD tray, and CHANGE THE BATTERY out for a smaller one!