What you can see here is totally rebuilt carrier from 42108 set, with unchanged supestructure.

All pictures can be found here:
https://bricksafe.com/pages/M_longer/42108-alt/rework

The goal was to significantly improve functions and look of the stock carrier.
It has the same wheelbase, but everything elses was designed from scratch.
Let's start with the visual side of this rework:

First thing that caught my eye were missing side mirrors. Its predecessor, the 8053 had it.
So I have added them in my version. Next thing that was changed are overall proportions of the cab itslef. Now it is wider, but shorter and higher, and thanks to that it resemble better shapes of cabs of various mobile cranes.

I wanted to keep style of stock cab, so there are macaroni bricks used, but due to way whole cab was built there are no opening doors either.
The main core of the chassis is almost the same, I wanted to keep the stock wheelbase and suprisingly it is alo very compact, which was crucial for adding the extendable outriggers.

Let's compare both carriers: Improved version has completely closed deck, while stock one had some flimsy mudguards only.

The most visible difference is seen when utriggers are fully deployed:
42108 had very short and hard to use outrigers, upgraded version has four extendable outriggers.

Video:
Few sample pages:


Instructions can be bought on Sellfy and Rebrickable, payments by PayPal or Credit Card.
Sellfy:

https://sellfy.com/p/whlbvy/ Rebrickable:

https://rebrickable.com/mocs/MOC-39009/M_longer/42108-upgraded-carrier/#bi

These are parts left after the build: And this is how it looks compared to my 42043 Mobile Crane: