Hi Rate1
Looks good...particularly the firewall
F1 former stock: 67gr or 2,36 oz
After it turned into a swiss cheese: 50gr or 1,76 oz
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Weight reduced: 17 gr, 0,6 oz (26%).
In spite of it having a YS 140 to support, its big and heavy enough as is to support your local friendly brick-built outhouse.....as is the similar part that mounts the cowling.
I never really thought that Lanier kits were particularly heavy (being a Weights Engineer) but these two parts really are heavy. You must bear in mind though that it would cost much more (and you & I would have to pay) for Bubba at Lanier to supply these parts with these lightening holes already cut out...its far cheaper if we do it!.
Go easy with those enginebox sides fwd of the firewall tho'....there is an awful lot of Shear and bending moment to be reacted here on the (hopefully infrequent) heavy landings...apply a few "G"s to the weight of your YS and you'll see what I mean. You can make the odd lightening hole here but their location is equally important so that you still have a good loadpath back to the firewall
...back to work...later...
Cheers