Finally turned up looks like it will do. Seems to be enough space to mount a rock pi x in a case and some sensors.  Will need to make some brackets up for the intel sensors and mount a battery to power motors for wheels and PC.  But for $51 Canadian quality seems ok. Will add some hbridges and i guess an Iotiny and a lidar etc. 

Yes I see that for 51.19 Amazon https://www.amazon.ca/gp/product/B08C7XF21N/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Planning to use a Lidar Nink?

Id use an ardunio pro micro instead of iotiny if there’s an onboard pc. The iotiny requires wifi and the arduino is usb

plus the arduino gives you a lot more ports.

@DJ Sadly  I don’t have an arduino pro micro kicking around but I have a bunch of esp32 so I guess i will try one of these.

@Proteusy on the LiDAR yeah I have an old Neato xv11 but I think  ARC NMS only works with the Hitachi so I may have to buy one of these but I think I will save that for later as navigation is pretty slick with the two intel sensors.

You can read the NMS page to see supported sensors

OK thanks @DJ  BTW does your ESP32 code support connection via a com port in ARC or just WiFi (I have only ever connected to ESP32 via WiFi but this obviously isn't ideal since PC is beside ESP and I would have to add a USB WiFi adapter)

Edit: OK I see on the ARC page it says ESP32 only supports WiFi and not COM port  https://synthiam.com/Products/ARC

I will put Jeremie as the person who solved this one as he gave me lots of info on the Mecanum wheels and how they work.  DJ I appreciate all the help and guidance and recommendation to switch to arduino. I have a solution running now but difficult to control so I think I will upgrade to a sabertooth and an Arduino Pro Micro.   I will post a video of the finished product when complete.