Yet Another Thread About Comments(tm)...
bigfrit, your comments were harsh, insultingly so. It's one thing to provide constructive criticism, it's another thing to use words like "sucks" and "rubbish" and "crappy inserting."
None of your reply in his post gave any feedback, tips or suggestions on how to make it better. You simply shit all over it. People post their work (and again, just my opinion, and what most people agreed with the last time this subject was brought up) to be critiqued in a professional manner, and to provide help. You didn't. You even took a cheapshot at his nickname, like that has anything to do with the situation.
From looking at his previous projects (and he's only had a handful, he's very new to the hobby) this is his first real kitbash, so problems are bound to creep up. In fact the only "harsh" criticism I'd have for him myself is to maybe slow down and take more time to see the project through before taking a bunch of pictures and posting them.
Here's how I would've responded, with your ideas but with my own methods:
I don't like it! Bleh more or less concludes my first view after reading your screenname.
In my honest opinion, it's a good effort and the idea is sound--crazy engine swaps in Caterhams are great! There are a few areas you need to work on, but the idea was sound.
You should first try your hand at basic stuff...
Next time you start a build, maybe take a little more time to test fit the components first, in particular the wheels, and sand down and unnecessary mold lines and injection pin marks... the rollcage, for example, has the right shape and thickness, but looks blocky because it was glued together hastily. Try gluing it together, and then going over it with a sanding stick for a while next time.
The paint sucks, the modifications (especially front wheels) suck and the result is not really convincing, with the rubbish rollcage and crappy inserting of other kit's parts.
The paint looks okay, but there's a fair bit of crazing in it--are you painting in cold or extra-humid conditions? Try to paint when temperature is around room temp, and if this is a consistent problem for you, you may want to try faster-drying top coats, like Dupli-color.
As far as the front wheels, one looks okay and the other one doesn't, so I suspect fitting Revell wheels isn't really the issue. Next time before you lay down the paint, test fit the wheels to the spindles to make sure they line up. If they don't, drilling out the wheels or repositioning the spindle will likely solve the problem.
As for the engine, it's an excellent choice and would make a wild ride in real life--400 hp in a Super 7! The engine looks reasonably detailed, and the carbon fibre on the fuel rail covers really sets it off--I'd maybe try running some rad hoses, either aftermarket or cutting up the stock ones, into and under the nose of the Super 7, since you can't really see the rad anyway. Some simple wiring of the battery would set it off nicely as well.
That wasn't so difficult....
Oh and deltableh, you forgot to put the steering wheel on