Ercoupe 415-C 9CF Baggage Compartement STC and 1320lb Gross Weight STC

Hi everyone, 

I am considering going through the process of installing the 9 Cubic Feet Baggage compartment STC and the 1320lb Gross Weight increase STC for my 415-C. I wanted to ask this forum if anyone has done these and if they could give me a general idea on the process involved with installing these? I want to see if it might be worth it to have a mechanic or shop do it. 
The Baggage Compartment installation looks like there will be some cutting and rewiring for the battery control switch. This looks like a lot of work but it seems straight forward. 
And the Gross weight increase looks like I will be installing a new 1 3/8" trim tab to replace my smaller tab. I have heard that there is an additional step to limit the travel of the elevator but I can't seem to find that anywhere online.

Thanks!