Attaching GRP bodywork

[voucht]

Hi,

2 questions:

1 - I fitted the nose cone but have only 4 attach points:

2 M6 bolts going through FF1 and the lower back face of the nose cone


2014-07-09_08-43-14 par Voucht71, sur Flickr

2 M6 studs in TR1/TR2, at the rear end the side faces.

2014-07-10_12-14-06 par Voucht71, sur Flickr

Is that enough? The problem is I can't find any other attach points without having to go through the GRP where it will be visible, which I absolutely want to avoid. I could add 2 more points at the front par of the side faces (about 200mm in front of the studs), but I will no be able to access the bolt with the air filter and its conducts fitted.
What do you think?

2 - Are rivnuts acceptable on GRP? I made a try on a piece of GRP with a M5 steel rivnut (7mm out. Diam.), and nothing cracked when I crimped it.


2014-07-10_12-24-21 par Voucht71, sur Flickr

But I don't know if it is solid enough. I'd like to attach the bulkhead panel to the scuttle with rivnuts inserted in the scuttle edge, so I won't need to remove the dashboard of I need to separate the bulkhead panel from the scuttle. I've plan 11 attach points.


2014-07-10_11-58-11 par Voucht71, sur Flickr

There will be almost no constraints on these points, as the horizontal face of the bulkhead panel is attached to the chassis, and so is the scuttle. However, the bulkhead panel supports quite a bit of weight: the expansion tank, the original big Sierra fuse and relay box and the ECU are attach to it.

Is this acceptable to your mind?

Thanks a lot.