First of all, thank you for your interest in this rocket.
There are some details I need to improve on my rocket and so, when my English version is ready, I will add a version 6.4 of the rocket.
I will also add additional information on how to easily change the power parameters of the rocket, and how to change (or add) a payload.
Francisdrake@: As you see in your image, these 2 boosters must be rotated.
But I'm sorry, I'm not at home otherwise I would have attached here the 2 extra boosters meshes files.
I'm using my son's computer, and I don't have here the program to do that.

You'll have to wait a bit, I'm going home in a few days.
About the weight of the rocket and the power of the engines, I could not put the real values of the rocket: it does not work.
So, the values written in the ini file do not correspond to the real values. Sorry for that....
And so, in order for you to have a rocket powerful enough to go into orbit with the payloadload you have
installed, you can modify (and test) the following values:
(The file is here : ...\Config\Kourou_Rockets\Ariane6\Ariane6_262.ini)
[BOOSTER_3] ; 2 Boosters (ESSR PC120C)
N=2 ;change with N=4
MeshName=Kourou_Rockets\Ariane6\Ariane6_262_Booster
off=(5.300,0.000,23.000)
angle=-45
Height=25.32
Diameter=5.16
EmptyMass=25000
;change this value
FuelMass=111000
Thrust=3500000
;modifies (increase ?) this value
Burndelay=0
BurnTime=137
Eng_1=(0,0,-19)
Eng_diameter=3.5
Eng_tex=Kourou_Rockets\Exaust\Exaustmomo_03
Eng_pstream1=booster
Eng_pstream2=diffuse
Speed=(3,0,4)
Rot_speed=(0,-0.1,0)
Expbolts_pos=(0,0,1)
Expbolts_pstream=Expbolts
Expbolts_anticipation=0.8
You can also mdify this sections:
[STAGE_1] ; Etage n°1 (LLPM H150)
Meshname="Kourou_Rockets\Ariane6\Ariane6_262_stage1"
(...)
EmptyMass=25000
FuelMass=150000
Thrust=1350000
(...)
[STAGE_2] ; Etage n°2 (ULPM H30)
Meshname="Kourou_Rockets\Ariane6\Ariane6_262_stage2"
(...)
EmptyMass=2600
FuelMass=25000
Thrust=48000
(...)
You can also change the
weight of your payload, this will
not change the characteristics of your vessel once it is jettisoned.
[PAYLOAD_1] ;
your payload
Meshname="Kourou_Rockets\Satellites\
<your vessel name>"
Off=(0.00,0.00,53.055)
;can be modified
Rotation=(90.000,0.000,225.000)
;can be modified
Height=4.000
;can be modified
Diameter=2.000
;can be modified
Mass=10.000
;can be modified
Module=
<your vessel path and cfg file name>
Name=
<your vessel name> ;(can be different with your cfg file)
Speed=(0.000,0.000,0.200)
Rot_speed=(0.000,0.000,0.000)
Render=0
Live=0
Please rename your new ini files (e.g. Ariane_test.ini)
and in the scn file remplace in the section :
Ariane6:Kourou_Rockets\Ariane6\Ariane6_262
(...)
CONFIG_FILE Config\
<path>\Ariane6_262.ini
with
CONFIG_FILE Config\
<path>\Ariane6_test.ini
If you have any other suggestions, tell me .
E.g. : Do you want me to put the
source files of the textures (photoshop.psd files) in the zip ?