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To open the case, first peel the rubbery sleeve from the front towards the back of the device, like this:

Note that all images are available in a higher resolution. You can see it by using "Open image in new tab" (Chromium et al.), or by going directly to the repository

Next, remove the four T10 screws that hold the two case halves together:

There are two PCBs. At the bottom of the lower of them we have the batteries, the analog front-ends for the oscilloscope part, and a few components that are probably at this place because of the large vertical clearance afforded by the batteries.

Remove the batteries before proceeding. Careful, their polarity is not clearly marked !

The analog front-ends (AFE) in detail:

Zooming in on Channel 1:

The next step is to remove the two T10 screws holding the lower PCB. When doing so, you will hear loose parts clacking. These are the isolation sleeves of the DMM receptacles.

On the other (top) side of the bottom PCB we find the measurement circuits, from left to right: BCN connectors for the oscilloscope, analog frontends, ADC, FPGA, a Semic CS7721C all-in-one DMM chip, and the DMM connectors.

A detailed view of ADC (Analog Devices AD9288) and FPGA (Lattice LCMXO2-1200HC-4TG100C), plus a number of 74x595:

At the bottom of the upper PCB, we have USB, what looks like power/charger circuits, and the FPC to the lower board:

Details:

The topmost PCB side has the MCU (STM32F103VET6) and the front panel elements (button contacts, LEDs, LCD FPS):

Last but not least, this is the inside view of the top shell: