I am just about at the end of building the MP4/4 and I have to say my overall impression of the model is one of disappointment.
It's just my opinion obviously but I much prefer the McLaren MP4/23 .
There were some faults with the parts not fitting very well on the MP4/23 but I think this build has caused other problems by over complicating the model by cramming too much in.
Diagostini obviously want to make as much money as possible from the subscriptions hence the 20 issues but considering most people will be displaying this model with the bodywork fitted in my opinion,and it's only my opinion,there is too much detail.
I do think better solutions could have been found for various parts of the build including the exhaust and the engine and gearbox parts and also that horrible sticky tape.
Too many parts have to be glued and over the length of the build the glue bond weakens which causes problems when you start the final assembly and the amount of cabling etc to fit makes the whole final assembly stressful to say the least.
Obviously my model building skills are not on a par with some of the build diaries on the forum and the fact that my eyes are not as good as they used to be,yes I am getting old ,has made this a harder build for me than some of you on here but I still feel disappointed in the model.
I like things to be perfect and luckily the few faults I have on the model will all be hidden under the bodywork but it's still frustrating knowing that the model is not as good as I want it to be and while some of that is my fault I do feel that the model has been made more difficult to build than it should have been.
I will post some photos once it's completely finished , good luck to you all with the final assembly.

I disagree, when I started doing 1/20 scale F1 cars I always wanted to be able to add extra details like plumbing and wiring like I'd seen online. However, I'm simply not at that level, and this car allows me to detail up the car without having vast experience. I will be showing this model without its body.
And in contrast with the MP4-23 cars from this era seem more... Messy? Under the cowling. All the interesting detail on the MP4-23 is in the aero, it still remains one of the most complex aero cars ever built. And for me, all the interesting detail on the MP4-4 is in the engine. I would've been disappointed if there was minimal detail under the body.

I must disagree as well!! The detail is there for a reason, it is an accurate scale model, and the option is there to display without the bodywork if you so wish. Building a model with this level of detail is not just an enjoyable and satisfying way to pass the time, it also gives an insight into the intricacies of the car that we wouldn't otherwise get. It may be challenging at times, but that surely adds to the satisfaction when it's completed.

I for one would be very disappointed if the kit lacked detail and went together without any degree of difficulty. Where's the fun in that?

As I said its just my opinion but having progressed even further with the final assembly I will stick by my opinion.
I have encountered a few problems with the fitting of the bodywork especially around the nose area where it does not fit completely together without a little bit of force and removal of plastic along the edges.
Maybe its me that's at fault but it does not seem to fit as well as I thought it would and also the panels that you fit to the bodywork in stage 20 seem to raise the bodywork up slightly.
A bit of careful work with the knife hopefully will rectify these matters and as I said its most probably me at fault.... good luck to you all with the final stage.