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Hmmm... interesting question. Firstly weld in cage is better for safety than bolt in, but still bolt in is quite safe. Also would depend on local regulations. In australia CAMs will allow weld in cages that follow the layout of bolt in cages, however FIA rules state that any weld in cage needs to be homologated (approx $500 in oz) a point that needs to be considered. Haven't had much experience with historics but will rules allow a weld in cage ? (is non original part of car after all).
Other thing is , how well can you weld ? In oz don't think any qualification needed, but still scruitineer inspects car before each race and can fail it if they believe welds are not up to scratch.
Could maybe tack it into positon and have a professional fully weld it afterwards. Most of the cost in a custom rollcage is the time to cut and notch all the tubes correctly, an option at least.
Can't vouch for the safety devices cage but have heard of others of similar type that just about fall into the car they are that easy to put together.
Hope this has helped you out.
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