A druid/Techsmith is infeasible according to the Forgotten Realms' rules
The rules given about how patron deities work in the Forgotten Realms preclude a character being both a druid and a Techsmith.
Firstly, from the 3e Forgotten Realms Campaign Setting, page 23 (emphasis mine):
Like clerics, the druids of Faerûn receive their spells from a particular patron deity, always a deity of nature or animals.
A druid's patron deity must be a druid whose portfolio is nature or at least animal-based. Faiths and Pantheons, page 8, backs this up by providing the following rules about the ability of deities to grant spells:
Most deities can grant spells from the cleric spell list, the ranger spell list, and from three or more domains. Deities with levels in the druid class can grant spells from the druid spell list, and deities with paladin levels can grant spells from the paladin spell list.
So a deity that is not a druid in their own right normally cannot grant druidic spells to followers.
Gond's portfolio is given as "artifice, craft, construction, smithwork"; he is not a deity of nature or animals, so not an appropriate patron for a druid in FR. Further, he is described on page 25 of F&P as having the class breakdown Rogue 10/Wizard 12/Cleric 8/Bard 10 (plus, of course, the default 20HD of outsider), which means he doesn't have any druid levels and thus cannot grant druid spells.
Since a Techsmith's patron must be Gond, and Gond cannot be a druid's patron, a druid would have to change patron from their original deity in order to qualify for the Techsmith class, an act which would cause them to lose all of their druid class features according to page 233 of the FRCS:
It is possible for a cleric, druid, paladin, or spellcasting ranger (or anyother divine spellcaster) to abandon his chosen deity and take up the faith of another deity. In doing so, the divine spellcaster loses all class features of the abandoned deity.
Such a character can resume progress in their divine spellcasting classes once they get in good with their new faith and receive an atonement (as per the spell), but it's arguable as to whether or not Gond would be able to offer the normal druid class features and he definitely can't offer druid-specific spells. (If I had a player who wanted to do this, I'd probably just let them rebuild as a cleric after they completed their transition to the new faith rather than shackle them with a bunch of useless druid levels.)
However - the Forgotten Realms is notable as being the only setting that has such strict rules about what deities various characters are allowed to worship, and also in mandating that divine spellcasters must be granted their power by a deity. In any other setting, these restrictions are largely absent, and if Gond is available in those settings (for example, in Planescape, because Planescape assumes all other settings are available within it) it should be possible for a druid to receive druidic powers from their communion with nature but also worship Gond and progress as a Techsmith.