Thanks for the comments everyone!
artoor, I seem the similiarity! it seems like F-22, F-35 and even B-2 have "beaks" !!
Kelmola the lego is going to stay because it fits really well and I could make something similar out of styrene, and it would look a tad better but this already exceeds my expectations so I am going to keep it. I am thinking about doing this same trick with a 1/48 Tomcat and 1/32 parts. it would definitely be more detailed and I would use styrene in that case. With a bigger scale you have to take more care.
update:
![](https://c1.staticflickr.com/9/8415/28338075944_1bc6e6d928_b.jpg)
The original 1/72 cockpit glued in a different location (and good god almighty did it fight me. It did not want to go there!) with a stand in 1/48 seat. The cockpit is going to be
extremely minimal. Might throw a figure in there to "hide" it.
![](https://c1.staticflickr.com/9/8710/28671339800_3073ab0b5d_b.jpg)
F-35 intake shape!
![](https://c1.staticflickr.com/9/8687/28852369472_f858c68464_b.jpg)
in an effort to "break up" the large flat panels at the rear I had to make some cuts and add more work.
![](https://c1.staticflickr.com/9/8813/28852380782_43563b6551_b.jpg)
I almost cut through the whole thing!
![Shocked :o](http://beyondthesprues.com/Forum/Smileys/clabIcons/shocked.gif)
![](https://c1.staticflickr.com/9/8183/28852359092_b8823b8cc6_b.jpg)
begin the blanking!
![](https://c1.staticflickr.com/9/8090/28852351292_dd7b8447eb_b.jpg)
lots of glue since it was rough shapes that would have to be sanded and cut on the model itself. Didn't want them breaking off. you can also see where I drilled holes for the new fins.
![](https://c1.staticflickr.com/9/8696/28671290470_872b245765_b.jpg)
new bottom
![](https://c1.staticflickr.com/9/8622/28340652253_0583f1e436_b.jpg)
![](https://c1.staticflickr.com/9/8792/28340636453_1b8673ecbb_b.jpg)
so the rear now has a large step. To be filled with small pieces, greeblies to give it a slightly more blended look. slight gap, easily filed. This is the nice thing about doing major kit surgery on smaller scales, fixes are just far easier.
![](https://c1.staticflickr.com/9/8516/28340643673_450ab61891_b.jpg)
Fin test fit
![](https://c1.staticflickr.com/9/8189/28880553981_493bae4723_b.jpg)
broke out the big guns. Hasegawa F-35A brought out of the stash to help with proportions and dimensions comparisons.
This 1/72 Tomcat converted to 1/48 would be about the size of an Av-8 Harrier. So its relatively small.